Olefin polymerization process

ABSTRACT

Disclosed herein is a process for the polymerization of ethylene, norbornenes and styrenes, by contacting in solution a selected nickel compound and a selected compound which is or can coordinated to the nickel with the olefin(s). The polymers produced are useful for films and molding resins.

This is a division of application Ser. No. 08/671,392, filed Jun. 27, 1996, now U.S. Pat. No. 5,714,556, which claims the benefit of U.S. Provisional Application Ser. No. 60/000,747, filed Jun. 30, 1995.

FIELD OF THE INVENTION

This invention concerns a process for the preparation of polyolefins by coordination polymerization of ethylene, styrene or norbornene by a nickel compound coordinated to a selected ligand.

TECHNICAL BACKGROUND

Polyolefins are very important items of commerce, being used for myriad uses, such as molding resins, films, ropes, composites, fibers, elastomers, etc. Suitability for any particular use is dependent on the polymer properties, for instance whether the polymer is elastomeric or thermoplastic. One method of polymerization of these olefins is by coordination polymerization, use of a polymerization catalyst containing a transition metal, the metal usually being thought of as coordinating to one or more species during the polymerization process.

Whether any particular transition metal compound is an olefin polymerization catalyst usually depends on the metal chosen and what is coordinated (such as various ligands) to the metal before and during the polymerization. Various transition metal compounds may or may not be active catalysts for a particular (type of) olefin, and the resulting polymer structures may vary. Other factors such as the efficiency and rate of polymerization may vary. Therefore, new transition metal catalysts for olefin polymerizations are constantly being sought.

SUMMARY OF THE INVENTION

This invention concerns a process for the polymerization of an olefin, comprising:

(a) contacting a polymerizable monomer consisting essentially of ethylene, a norbornene or a styrene, and a catalyst system comprising the product of mixing in solution a zerovalent tricoordinate or tetracoordinate nickel compound (II) which has at least one labile ligand, and all ligands are neutral, an acid of the formula HX (IV), and a first compound selected from the group consisting of: ##STR1##

wherein:

X is a noncoordinating anion;

Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl;

each Q is --NR² R⁴³ or --CR⁹ ═NR³ ;

n is 1 or 2;

E is 2-thienyl or 2-furyl;

each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl;

each R⁹ is independently hydrogen or hydrocarbyl; and

each R³ is independently a monovalent aromatic moiety;

m is 1, 2 or 3;

R⁴³ is hydrogen or alkyl;

each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms;

each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

Ar² is an aryl moiety;

R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group;

R¹¹ and R¹⁵ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less;

each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms;

Ar³ is an aryl moiety;

R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl;

Ar⁴ is an aryl moiety;

Ar⁵ and Ar⁶ are each independently hydrocarby;

Ar⁷ and Ar⁸ are each independently an aryl moiety;

Ar⁹ and Ar¹⁰ are each independently an aryl moiety or --CO₂ R²⁵, wherein R²⁵ is alkyl containing 1 to 20 carbon atoms;

Ar¹¹ is an aryl moiety;

R⁴¹ is hydrogen or hydrocarbyl;

R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ;

R⁴⁴ is aryl;

R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and

R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety.

This invention also concerns a catalyst for the polymerization of ethylene, a norbornene, or a styrene, comprising, the product of mixing in solution a zerovalent tricoordinate or tetracoordinate nickel compound (II) which has at least one labile ligand and all ligands are neutral, an acid of the formula HX (IV), and a compound selected from the group consisting of: ##STR2##

wherein:

X is a noncoordinating anion;

Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl;

each Q is --NR² R⁴³ or --CR⁹ ═NR³ ;

n is 1 or 2;

E is 2-thienyl or 2-furyl;

R⁴³ is hydrogen or alkyl;

each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl;

each R³ is independently a monovalent aromatic moiety;

each R⁹ is independently hydrogen or hydrocarbyl;

m is 1, 2 or 3;

each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms;

each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

Ar² is an aryl moiety;

R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group;

R¹¹ and R¹⁵ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less;

each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms;

Ar³ is an aryl moiety;

R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl;

Ar⁴ is an aryl moiety;

Ar⁵ and Ar⁶ are each independently hydrocarby;

Ar⁷ and Ar⁸ are each independently an aryl moiety;

Ar⁹ and Ar¹⁰ are each independently an aryl moiety, --CO₂ R²⁵, or Ar⁷ and Ar⁸ taken together are a divalent aromatic moiety and wherein R²⁵ is alkyl containing 1 to 20 carbon atoms;

Ar¹¹ is an aryl moiety;

R⁴¹ is hydrogen or hydrocarbyl;

R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ;

R⁴⁴ is aryl;

R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and

R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety;

and provided that the molar ratio of (III), (V) (XVI), (XVII), (XVIII), (XIX), (XX), (XXI), (XXII), (XXIII), (XXIV), (XXV), (XXVI) , (XXVII), (XXVIII), (XXXVI) or (XXXVII):(II) is about 0.5 to about 5, and the molar ratio of (IV):(II) is about 0.5 to about 10.

This invention also concerns a process for the polymerization of an olefin, comprising, contacting ethylene, a norbornene, or a styrene with a nickel [II] complex of a ligand selected from the group consisting of: ##STR3##

wherein:

X is a noncoordinating anion;

Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl;

each Q is --NR² R⁴³ or --CR⁹ ═NR³ ;

R⁴³ is hydrogen or alkyl;

n is 1 or 2;

E is 2-thienyl or 2-furyl;

each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl;

each R³ is independently a monovalent aromatic moiety;

each R⁹ is independently hydrogen or hydrocarbyl; m is 1, 2 or 3;

each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms;

each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

Ar² is an aryl moiety;

R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group;

R¹¹ and R¹⁵ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less;

each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms;

Ar³ is an aryl moiety;

R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl;

Ar⁴ is an aryl moiety;

Ar⁵ and Ar⁶ are each independently hydrocarby;

Ar⁷ and Ar⁸ are each independently an aryl moiety;

Ar⁹ and Ar¹⁰ are each independently an aryl moiety, --CO₂ R²⁵, or Ar⁷ and Ar⁸ taken together are a divalent aromatic moiety and wherein R²⁵ is alkyl containing 1 to 20 carbon atoms;

Ar¹¹ is an aryl moiety;

R⁴¹ is hydrogen or hydrocarbyl;

R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ;

R⁴⁴ is aryl;

R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and

R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety.

Described herein is a process for the polymerization of olefins, comprising, contacting ethylene, a norbornene or a styrene with a nickel containing first compound of the formula [L¹ _(q) L² _(r) L³ _(s) L⁴ _(t) Ni]⁺ X⁻ (XXXIII), wherein:

L¹ is a first monodentate neutral ligand coordinated to said nickel, L² is a second monodentate neutral ligand coordinated to said nickel which may be said first monodentate neutral ligand and r is 0 or 1, or L¹ and L² taken together are a first bidentate neutral ligand coordinated to said nickel and r is 1;

L³ and L⁴ taken together are a π-allyl ligand coordinated to said nickel, L³ and L⁴ taken together are ##STR4## coordinated to said nickel, or L³ is a third neutral monodentate ligand selected from the group consisting of ethylene, a norbornene and a styrene or a neutral monodentate ligand which can be displaced by an olefin, and L⁴ is R³⁸ ;

X is a relatively non-coordinating anion;

each of q, s and t is 1;

said first monodentate neutral ligand and said first bidentate neutral ligand are selected from the group consisting of ##STR5##

Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl;

each Q is --NR² R⁴³ or --CR⁹ ═NR³ ;

R⁴³ is hydrogen or alkyl;

n is 1 or 2;

E is 2-thienyl or 2-furyl;

each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl;

each R⁹ independently hydrogen or hydrocarbyl; and

each R³ is independently a monovalent aromatic moiety;

m is 1, 2 or 3;

each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms;

each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

Ar² is an aryl moiety;

R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group;

R¹¹ and R¹⁵ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less;

each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms;

Ar³ is an aryl moiety;

R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl;

Ar⁴ is an aryl moiety;

Ar⁵ and Ar⁶ are each independently hydrocarby;

Ar⁷ and Ar⁸ are each independently an aryl moiety;

Ar⁹ and Ar¹⁰ are each independently an aryl moiety or --CO₂ R²⁵, wherein R²⁵ is alkyl containing 1 to 20 carbon atoms;

Ar¹¹ is an aryl moiety;

R⁴¹ is hydrogen or hydrocarbyl;

R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ;

R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and

R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety;

R³⁵ is hydrocarbylene;

R³⁶ is hydrogen, alkyl, or --C(O) R³⁹ ;

each R³⁷ is hydrocarbyl or both of R³⁷ taken together are hydrocarbylene to form a carbocyclic ring;

R³⁸ is hydride, alkyl or --C(O)R³⁹ ; and

R³⁹ is hydrocarbyl

R⁴⁴ is aryl.

Also described herein is a compound of the formula [L¹ _(q) L² _(r) L³ _(s) L⁴ _(t) Ni]⁺ X⁻ (XXXIII), wherein:

L¹ is a first monodentate neutral ligand coordinated to said nickel, L² is a second monodentate neutral ligand coordinated to said nickel which may be said first monodentate neutral ligand and r is 0 or 1, or L¹ and L² taken together are a first bidentate neutral ligand coordinated to said nickel and r is 1;

L³ and L⁴ taken together are a π-allyl ligand coordinated to said nickel, L³ and L⁴ taken together are ##STR6## coordinated to said nickel, or L³ is a third neutral monodentate ligand selected from the group consisting of ethylene, a norbornene and a styrene or a neutral monodentate ligand which can be displaced by an olefin, and L⁴ is R³⁸ ;

X is a relatively non-coordinating anion;

q, s and t are each 1;

said first monodentate neutral ligand and said first bidentate neutral ligand are selected from the group consisting of ##STR7##

wherein:

Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl;

each Q is --NR² R⁴³ or --CR⁹ ═NR³ ;

R⁴³ is hydrogen or alkyl;

n is 1 or 2;

E is 2-thienyl or 2-furyl;

each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl;

each R⁹ is independently hydrogen or hydrocarbyl; and

each R³ is independently a monovalent aromatic moiety;

m is 1, 2 or 3;

each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms;

each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl;

Ar² is an aryl moiety;

R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group;

R¹¹ and R¹³ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less;

each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms;

Ar³ is an aryl moiety;

R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl;

Ar⁴ is an aryl moiety;

Ar⁵ and Ar⁶ are each independently hydrocarby;

Ar⁷ and Ar⁸ are each independently an aryl moiety;

Ar⁹ and Ar¹⁰ are each independently an aryl moiety or --CO₂ R²⁵, wherein R²⁵ is alkyl containing 1 to 20 carbon atoms;

Ar¹¹ is an aryl moiety;

R⁴¹ is hydrogen or hydrocarbyl;

R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ;

R⁴⁴ is aryl;

R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and

R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety;

R³⁵ is hydrocarbylene;

R³⁶ is hydrogen, alkyl, or --C(O)R³⁹ ;

each R³⁷ is hydrocarbyl or both of R³⁷ taken together are hydrocarbylene to form a carbocyclic ring;

R³⁸ is hydride, alkyl or --C(O)R³⁹ ; and

R³⁹ is hydrocarbyl.

Described herein is a compound of the formula ##STR8##

wherein:

E is 2-thienyl or 2-furyl;

Ar⁵ and Ar⁶ are each independently hydrocarby.

DETAILS OF THE INVENTION

The olefins polymerized herein are ethylene, a styrene and a norbornene. Norbornene and styrene may be present in the same polymerization, and a copolymer may be produced. By a styrene herein is meant a compound of the formula ##STR9## wherein R²⁶, R²⁷, R²⁶, R²⁹ and R³⁰ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, all of which are inert in the polymerization process. It is preferred that all of R²⁶, R²⁷, R²⁶, R²⁹ and R³⁰ are hydrogen.

By "a norbornene" is meant that the monomer is characterized by containing at least one norbornene-functional group in its structure including norbornadiene as identified by the formulas below, which can be substituted or unsubstituted ##STR10## wherein "a" represents a single or double bond.

Representative monomers are compounds (XXXV) and (XXXX) as follows: ##STR11## wherein R⁴⁶, R⁴⁷, R⁴⁸, and R⁴⁹ independently are hydrogen halogen, or hydrocarbyl, provided that, except if the hydrocarbyl group is vinyl, if any of the hydrocarbyl are alkenyl, there is no terminal double bond, i.e., the double bond is internal; or R⁴⁶ and R⁴⁸ taken together can be part of carbocyclic ring (saturated, unsaturated or aromatic); or R⁴⁶ and R⁴⁷ and/or R⁴⁸ and R⁴⁹ taken together are an alkylidene group. In these structures "z" is 1 to 5.

Examples of such norbornenes include norbornadiene, 2-norbornene, 5-methyl-2-norbornene, 5-hexyl-2-norbornene, 5-ethylidene-2-norbornene, vinylnorbornene, dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene, trimers of cyclopentadiene, halogenated norbornenes wherein R⁴⁶, R⁴⁷, R⁴⁸ and R⁴⁹ may also be halogen or fully halogenated alkyl groups such as C_(w) F_(2w+1) wherein w is 1 to 20, such as perfluoromethyl and perfluorodecyl.

The halogenated norbornenes can be synthesized via the Diels-Alder reaction of cyclopentadiene an appropriate dieneophile, such as F₃ CC.tbd.CCF₃ or R⁴⁹ ₂ C═CR⁴⁹ C_(w) F_(2w+1) wherein each R⁴⁹ is independently hydrogen or fluorine and w is 1 to 20.

It is also preferred that in the polymerization processes described herein that the polymer produced has an average degree of polymerization of about 10 or more, more preferably about 20 or more, and especially preferably about 50 or more.

In the polymerization processes and catalyst compositions described herein certain groups may be present. By hydrocarbyl is meant a univalent radical containing only carbon and hydrogen. By saturated hydrocarbyl is meant a univalent radical which contains only carbon and hydrogen, and contains no carbon-carbon double bonds, triple bonds and aromatic groups. By substituted hydrocarbyl herein is meant a hydrocarbyl group which contains one or more (types of) substitutents that does not interfere with the operation of the polymerization catalyst system. Suitable substituents include halo, ester, keto (oxo), amino, imino, carboxyl, phosphite, phosphonite, phosphine, phosphinite, thioether, amide, nitrile, and ether. Preferred substituents are halo, ester, amino, imino, carboxyl, phosphite, phosphonite, phosphine, phosphinite, thioether, and amide. By benzyl is meant the C₆ H₅ CH₂ -- radical, and substituted benzyl is a radical in which one or more of the hydrogen atoms is replaced by a substituent group (which may include hydrocarbyl). By phenyl is meant the C₆ H₅ -- radical, and a phenyl moiety or substituted phenyl is a radical in which one or more of the hydrogen atoms is replaced by a substituent group (which may include hydrocarbyl). Preferred substituents for substituted benzyl and phenyl include those listed above for substituted hydrocarbyl, plus hydrocarbyl. If not otherwise stated, hydrocarbyl, substituted hydrocarbyl and all other groups containing carbon atoms, such as alkyl, preferably contain 1 to 20 carbon atoms.

By an aromatic moiety herein is meant a radical containing at least one carbocyclic or heterocyclic aromatic ring, which has a number of free valences to the carbon atoms of the aromatic carbocyclic ring(s). A monovalent aromatic moiety has one free valence, and herein is termed an aryl moiety. If there is more than one aromatic ring in the radical, the ring may be joined by covalent bonds (as in biphenyl) or may be fused (as in naphthalene), or both. The free valencies may be at carbon atoms in one ring, or more than one ring if more than one ring is present. The aromatic ring(s) may be substituted by hydrocarbyl groups or other substitutents which don't interfere with the catalytic activity of the catalyst system. Substituents that aid the polymerization may be present. Suitable and preferred substituents are as listed above for substituted hydrocarbyl groups. Suitable aromatic radicals herein include phenyl, o-phenylene, 1,8-naphthylene, and 2-thiophenyl.

A transition metal compound which may be initially added to a polymerization process mixture is (II), a zerovalent nickel compound which is tricoordinate or tetracoordinate. Also included within the definition of this zerovalent nickel compound are mixtures of compounds which will generate suitable zerovalent nickel compounds in situ, such as mixtures of nickel compounds in higher valence states with suitable reducing agents. The ligands which are coordinated to the nickel atom may be monodentate or polydentate, so long as the nickel compound is tricoordinate or tetracoordinate. The ligands should be such that at least two, and preferably all, of the coordination sites of the nickel atom are coordinated to ligands which are readily, reversibly or irreversibly, displaceable by (III),(V), or any one of (XVI) to (XIX), (XXXVI) and (XXXVII). Such readily displaceable ligands include η⁴ -1,5-cyclooctadiene and tris(o-tolyl)phosphite (which is a phosphite with a large cone angle), ethylene and carbon monoxide. A preferred nickel compound (II) is bis(η⁴ -1,5-cyclooctadiene)nickel[0].

By the compound HX is meant the acid of a noncoordinating monoanion, or the equivalent thereof, i.e., a combination of compounds that will generate this acid. Noncoordinating anions are well known to the artisan, see for instance W. Beck., et al., Chem. Rev., vol. 88, p. 1405-1421 (1988), and S. H. Strauss, Chem. Rev., vol. 93, p. 927-942 (1993), both of which are hereby included by reference. Relative coordinating abilities of such noncoordinating anions are described in these references, Beck at p. 1411, and Strauss at p. 932, Table III. Also useful in this process in place of HX are "solid" acids, such as acidic aluminas, clays and zirconias, which are considered herein to be acids with relatively non-coordinating anions.

Preferred anions X are BF₄ ⁻, PF₆ ⁻, and BAF {tetrakis[3,5-bis(trifluoromethyl)phenyl]borate}, SbF⁻, and BAF is especially preferred. The acids of these anions are known, for instance HBF₄ is commercially available, and HBAF can be made by the method described in M. Brookhart, et al., Organometallics, vol. 11, p. 3920-3922 (1992).

In all forms of (III) it is preferred that R⁹ and R⁴³ are hydrogen. If R⁴³ is alkyl, it is preferred that it is methyl. In all forms of (III), each R² may be independently hydrogen, hydrocarbyl or substituted hydrocarbyl, and it is preferred that each R² is hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl.

In one preferred form of (III), n is 1 and Q is --NR² R⁴³. It is preferred that R² is hydrogen and that Ar¹ is 2,6-dialkylphenyl or amide, carboxy, or keto substituted phenyl. More preferably, Ar¹ is 2,6-diisopropylphenyl, 2-carbomoylphenyl, 2-carboxyphenyl, or 2-benzoylphenyl.

In another preferred form of (III), n is 2 and each Q is --NR² R⁴³. In this instance it is more preferred that R² is hydrogen, and/or Ar¹ is o-phenylene or 1,8-naphthylene, and it is especially preferred that Ar¹ is 1,8-naphthylene.

In (III), when n is 1 and Q is --CR⁹ ═NR³, it is preferred that R⁹ is hydrogen, and R³ is preferably 2,6-dialkylphenyl, or amide, ester, carboxyl, keto, or halo substituted phenyl. More preferably, R³ is 2,6-diisopropylphenyl, 2-carbomoylphenyl, 2-carbomethoxyphenyl, 2-carboxyphenyl, 1-fluoren-9-onyl, 1-anthraquinolyl, or pentafluorophenyl. Ar¹ is aryl, or halo, ester, amino, imino, carboxyl, phosphite, phosphonite, phosphine, phosphinite, ether, thioether, or amide substituted phenyl. More preferably, Ar¹ is diphenylmethyl, 9-anthracenyl, 2-furanyl, 2-thiofuranyl, 2-phenolyl, or 2-hydroxy-naphthyl. When Ar¹ is diphenylmethyl, these tautomeric forms are believed to exist when these compounds are complexed to nickel.

When in (III) n is 2 and Q is --CR⁹ ═NR³, it is preferred that Ar¹ is p-phenylene, and that R³ is 2,6-disubstituted phenyl in which the substitutents are halo, alkyl, or halo and alkyl.

In (III), when Q is --NHR², R² taken together with Ar¹ may form a carbocyclic or heterocyclic ring, as long as the atom of R² attached directly to the nitrogen atom is a saturated carbon atom. Thus another preferred compound (III) is ##STR12## It will be noted that there are actually two amino groups in this compound that meet the criteria for Q. This is compound 105, below.

For (V) it is preferred that m is 1, all of R⁴, R⁵, R⁶, R⁷ and R¹⁰ are hydrogen, and both of R⁸ are 2,6-dialkylphenyl, especially 2,6-diisopropylphenyl, or cyclohexyl. In another preferred compound (V) m is 1, all of R⁴, R⁵, R⁶, and R⁷ are hydrogen, both of R⁸ are phenyl, and both of R¹⁰ are ethyl. In (V) too much or too little steric hindrance around the nitrogen atoms may cause a catalytic composition containing such a compound to be ineffective as an olefin polymerization catalyst.

In (XVI) is preferred that Ar² is phenyl, 2-pyridyl, or 3-hydroxyl-2-pyridyl, and/or R¹⁰ is hydrogen, phenyl, 2,6-diisopropylphenyl,1-naphthyl, 2-methyl-1-naphthyl, or 2-phenylphenyl.

In (XVII) it is preferred that R¹² and R¹⁴ are hydrogen, and/or R¹³ is hydrogen or t-butyl, and/or R¹¹ and R¹⁵ are both t-butyl or both phenyl, and/or R¹¹ is t-butyl and R¹⁵ is 2-hydroxy-3,5-di-t-butylphenyl. Note that when R¹⁵ is 2-hydroxy-3,5-di-t-butylphenyl the compound contains 2 phenolic hydroxy groups, both of which are sterically hindered.

The steric effect of various groupings has been quantified by a parameter called E_(s), see R. W. Taft, Jr., J. Am. Chem. Soc., vol. 74, p. 3120-3128 (1952), and M. S. Newman, Steric Effects in Organic Chemistry, John Wiley & Sons, New York, 1956, p. 598-603. For the purposes herein, the E_(s) values are those described in these publications. If the value for E_(s) for any particular group is not known, it can be determined by methods described in these publications. For the purposes herein, the value of hydrogen is defined to be the same as for methyl. It is preferred that the total E_(s) value for the ortho (or other substituents closely adjacent to the --OH group) substitutents in the ring be about -1.5 or less, more preferably about -3.0 or less. Thus in a compound such as 2,4,6-tri-t-butylphenol only the E_(s) values for the 2 and 6 substituted t-butyl groups would be applicable.

In (XX) it is preferred that both R¹⁶ and R¹⁷ are hydrogen or that both are acyl. A preferred acyl group is CH₃ C(O)--.

In (XXI) it is preferred that Ar³ is phenyl or substituted phenyl, more preferably phenyl.

In (XXII) it is preferred that both of R¹⁸ and R¹⁹ are methyl, or both are hydrogen.

In (XXIII) it is preferred that Ar⁴ is phenyl or substituted phenyl, more preferably phenyl.

In (XXIV) it is preferred that Ar⁵ and Ar⁶ are independently phenyl, substituted phenyl, or cyclohexyl, and it is especially preferred when both are cyclohexyl or both are phenyl.

In (XXVI) it is preferred that Ar⁷ and Ar⁸ are independently phenyl or substituted phenyl. In a specific preferred compound, Ar⁷ is phenyl or p-tolyl and Ar⁸ is 2,6-diisopropylphenyl.

In (XXVII) it is preferred that R²⁵ is methyl. Specific preferred compounds are ##STR13## Note that in one of these compounds there are 2 thiourea groups present.

In (XXVIII) it is preferred that R²², R²³ and R²⁴ are each independently o-tolyl, 2,4,6-trimethoxyphenyl, 2,6-dimethoxyphenyl, 2-methoxyphenyl, and 2,3,6-trimethoxyphenyl. Other preferred groups for R²⁴ are ethyl, isopropyl and phenyl. It is also preferred that R²⁴ is an aryl moiety. In another preferred form, when R²², R²³ and/or R²⁴ are phenyl or substituted phenyl, there is at least one alkoxy group, preferably a methoxy group, ortho (in the benzene ring) to the phosphorous atom. Another compound (XXVIII) is 1,3-bis[(bis-2,6-dimethoxyphenyl)phosphino]propane. This compound actually has two phosphine groups that each structurally meet the requirements for a compound of type (XXVIII).

It is also preferred that each of R²², R²³, and R²⁴ (when it is an aryl moiety) contain electron donating groups bound to the aromatic moiety through a carbon atom of an aromatic ring. The concept of electron donating groups is well known to the artisan. One method of measuring the electron donating ability of a group (particularly in a benzene ring, but it is not limited to such rings) which is not adjacent to the "active" center is by using the Hammett equation, see for instance H. H. Jaffe, Chem. Rev., vol. 53, p. 191-261 (1953). The actual result of this is called the Hammett σ constant. For ortho (adjacent) substituents one may use the Taft σ* constant as determined by measurements on orthobenzoate esters, see for instance R. W. Taft, Jr., J. Am. Chem. Soc., vol. 74, p. 3120-3128 (1952); ibid., vol. 75, p. 4231-4238 (1953); and C. K. Ingold, Structure and Mechanism in Organic Chemistry, 2nd Ed., Cornell University Press, Ithaca, 1969, p. 1220-1226. It is preferred that the total of the σ and σ* constants for any of the groups R²², R²³, and R²⁴ (when it is an aryl moiety) be about -0.25 or less, more preferably about -0.50 or less (it is noted that the σ and σ* constants for electron donating groups are negative, so the more electron donating groups present, the more negative this total becomes) and especially preferably about -0.75 or less.

In (XXXVI) it is preferred that Ar¹¹ is 2,6-dialkylphenyl, more preferably 2,6-dimethylphenyl or 2,6-diisopropylphenyl. It is preferred that R⁴² is --C(O)--NR⁴¹ --Ar¹¹. It is preferred that R⁴¹ is hydrogen.

In (XXXVII) it is preferred that m is 1, and/or all of R⁴, R⁵, R⁶ and R⁷ are hydrogen, and/or both of R⁸ are aryl moieties, more preferably both of R⁸ are 2,6-dialkylphenyl, and especially preferably both of R⁸ are 2,6-dimethylphenyl.

In some of the compounds herein, the group --CHPh₂, diphenylmethyl, may appear, especially when the methine carbon atom can be bound to the carbon atom of an imine. In this case one can write such a compound as --N═CH--CHPh₂ (the imine form) or as --NH--CH═CPh₂ (amine form). It has been found that in the free compounds (not complexed to nickel) this group is usually in the amine form. However, in a few of the nickel complexes of these types of compounds the preliminary evidence indicates the ligand is present in the imine form. Therefore, one may consider these forms interchangeable for the purposes herein, and it is noted that both types of compounds are mentioned in the claims herein.

The ligands can be made by methods that can be readily found in the literature, and/or are available commercially or form laboratory supply houses, or are described in the Examples herein.

The polymerization may also be carried out by [L¹ _(q) L² _(r) L³ _(s) L⁴ _(t) Ni]⁺ X⁻ (XXXIII), which may be formed in situ or added directly to the initial polymerization mixture. For example, (XXXIII) may be in the form of a π-allyl complex. By a π-allyl group is meant a monoanionic radical with 3 adjacent sp² carbon atoms bound to a metal center in an η³ fashion. The three sp² carbon atoms may be substituted with other hydrocarbyl groups or functional groups. Typical π-allyl groups include ##STR14## wherein R is hydrocarbyl. In (XXXIII) when it is a π-allyl type complex, L³ and L⁴ taken together are the π-allyl group. As shown in many of the Examples herein, these π-allyl compounds may be stable, and may be used themselves to initiate the olefin polymerization.

Initiation with π-allyl compounds may be sluggish at times. Initiation of π-allyl compounds can be improved by using one or more of the following methods:

Using a higher temperature such as about 80° C.

Decreasing the bulk of the ligand, such as R² and R⁵ being 2,6-dimethylphenyl instead of 2,6-diisopropylphenyl.

Making the π-allyl ligand more bulky, such as using ##STR15## rather than the simple π-allyl group itself. Having a Lewis acid present while using a functional π-allyl. Relatively weak Lewis acids such a triphenylborane, tris(pentafluorophenyl)borane, and tris(3,5-trifluoromethylphenyl)borane, are preferred. Suitable functional groups include chloro and ester. "Solid" acids such as montmorillonite may also be used.

However, (XXXIII) may also be present in the polymerization in other "forms". For instance, L³ may be an olefin, such as ethylene, a norbornene or a styrene or a ligand capable of being displaced by an olefin. By a ligand capable of being displaced by an olefin is meant that the ligand is more weakly coordinating to nickel than an olefin, and when in the complex is in contact with an olefin, the olefin displaces it. Such ligands are known in the art and include dialkyl ethers, tetrahydrofuran and nitriles such as acetonitrile.

When L³ is an olefin, L⁴ may be --R³⁵ R³⁶. R³⁵ is alkylene, but it actually is a "polymeric" fragment with one or more repeat units (derived from the olefin(s) being polymerized) making up R³⁵. In this form (XXXIII) may be said to be a living ended polymer, further polymerization adding more repeat units to R³⁵. R³⁶ may be thought of as the end group of the polymeric group R³⁵, and may be derived from the similar grouping such as R³⁸ which was originally coordinated to the nickel.

When L³ and L⁴ in (XXXIII) taken together are (XXXII), (XXXIII) may also be thought of as a living polymer. This type of grouping is often referred to as an "agostic" coordination, and in this group --R³⁵ R³⁶ may be thought of in the same way as described above. Whether a living ended molecule will be in a form with a coordinated olefin or contain (XXXII) will depend on the other ligands coordinated to nickel, and the nature of the olefin being polymerized. It is believed that cyclic olefins tend to have living ends containing agostic groupings.

In (XXXIII) it is preferred that r is 1. The second monodentate neutral ligand may be any ligand which fits this description, including being the same as the first neutral monodentate ligand. Oftentimes though this ligand is a dialkyl ether such as diethyl ether or an aliphatic nitrile such as acetonitrile, or tetrahydrofuran. By "neutral" in the context of (XXXIII) is meant that the ligand is electrically neutral, i.e., is not charged. In (XXXIII) preferred structures for the first neutral monodentate ligand are those shown above. However, in certain circumstances, L¹ and L² may be a single neutral bidentate ligand of the same formula as when L¹ is a neutral monodentate ligand. In other words, some of the compounds (III), (V), (XVI) to (XXVIII), (XXXVI) and (XXXVII) may act as bidentate ligands in (XXXIII). This may depend on the ligand itself, what the ratio of ligand to Ni is, what the other ligands may be, and whether there are any other compounds present which may also act as ligands.

When r in (XXXIII) is zero, simple dimers (containing 2 Ni atoms) with bridging ligands of the compound [L¹ L³ L⁴ Ni]⁺ X⁻ are also included within the definition of (XXXIII). For instance a dimer containing L¹, r is zero, and L³ and L⁴ are combined into an π-allyl group could have the formula ##STR16## In this structure both L¹ ligands are bridging between the 2 nickel atoms. This type of dimer is familiar to those skilled in the art, and is believed to readily disassociate into "monomeric" nickel compounds on exposure to olefin.

Some of the forms of (XXXIII) are relatively unstable, and are difficult to isolate as pure compounds. Nevertheless their presence can be demonstrated by various methods known in the art. For instance, "living end" and other forms of (XXXIII) may be detected in solution by nuclear magnetic resonance (NMR) analysis, especially a combination of ¹ H and ¹³ C NMR. Such detection of living ends is usually best done when R³⁵ contains relatively few repeat units.

(XXXIII) may be made by methods described herein, especially in the Examples, or may actually be formed in situ at the beginning of or during the polymerization process. It is believed that when (III), (V), (XVI) to (XXVIII), (XXXVI) or (XXXVII), and (II) and HX are mixed together in solution a coordination compound such as (XXXIII) is formed which is active as a catalyst for the polymerization of olefins.

The preparation of one of the catalyst systems, when (II) is used, may be carried out in solution. By solution is meant that (II) and (III), (V), (XVI) to (XIX), (XXXVI) or (XXXVII), and (IV) are at least initially somewhat soluble in the solvent chosen. By somewhat soluble is meant that at least a 0.01 molar solution of each of the components in the solvent may be formed under process conditions. This catalyst system may them be removed from the solvent, as by evaporation of the solvent under vacuum, and then contacted with one or more olefins to carry out the polymerization. However, it is preferred to carry out the polymerization in the presence of the "original" solvent in which the active catalyst is formed. One or more of the components, including the polymer product, may become insoluble as the polymerization proceeds. Useful solvents include hydrocarbons such as toluene or benzene. Benzene is a preferred solvent. The benzene used herein is benzene-d₆.

Although it is not critical, when (II) is present it is preferred that the molar ratio of (III), (V), (XVI) to (XXVIII), (XXXVI) or (XXXVII):(II) is about 0.5 to 5, and the molar ratio of (IV):(II) is about 0.5 to about 10. It is also preferred that all the polymerizations be carried out at a temperature of about -100° C. to about +200° C., more preferably about -20° C. to about +100° C.

The polymers produced by this process are useful as molding resins, films and elastomers.

Most of the formulas for (III), (V), (XVI) to (XXVIII), (XXXVI) and (XXXVII) are generic formulas and embrace a wide range of actual compounds. The ability of such individual compounds to form active polymerizations catalysts, and the actual activity of those catalysts, will be dependent on the structure of the individual compound used, and the circumstances under which it is used. For instance, whether such a compound will be active and how active it will be will be dependent to some extent on its actual structure, and particularly how that structure affects the steric and electronic properties of the compound as a ligand on nickel. If there is too much or too little steric hindrance about the group that actually coordinates to the nickel atom, the compound may be ineffective. Similarly, if the group that actually coordinates to the nickel is made too electron rich or poor, the compound may be made ineffective.

This may be illustrated by the following list of compounds, which were ineffective in catalyzing the polymerization of ethylene under the conditions described for Examples 23-66. The specific compounds are: ##STR17##

However, as mentioned above these compounds failed under a specific set of conditions. If one peruses through the Examples herein, one will find that certain of these compounds may fail to promote polymerization by one method, while be active in another method, and/or one finds the yield of polymer may change significantly under different conditions. Therefore failure in any particular polymerization process doesn't mean failure in all.

Conditions in such processes may be varied, for instance the pressure, temperature and solvent used. The polymerizations may be carried out in slurry, solution or the gas phase, in continuous, semi-batch or batch reactors. In addition, the particular starting form of the (proto)catalyst system may affect reactivity. For instance, differences may be found when using (II) as a starting material than when using a preformed π-allyl complex.

Determining the activity of any particular compound which is described herein is relatively easy. The compound may be used in any of the polymerization systems described herein, and if needed the conditions, such as temperature and pressure, may be varied. Particularly for polymerizations in which the active nickel catalyst is formed in situ, it may be important that the catalyst components all be soluble, at least initially, so solvent selection may be important. Such experiments are simple and quick to run and don't involve much experimentation.

It is also noted that some forms of (XXXIII) may be prepared by other methods known in the art, see for instance copending U.S. application Ser. No. 08/590,650, filed Jan. 24, 1996 (CR9608D) which is hereby included by reference.

In all of the polymerization processes and polymerization catalysts herein it is preferred that one or more of the following not be significantly present: an organoaluminum compound; an aluminum halide; any other transition metals, especially titanium and/or zirconium; reducing agents, especially metal or metalloid hydrides; and any organometalic compound except for nickel compounds. By not significantly present is meant there is not enough present to affect the course of the polymerization. It is more preferred that one or more of these be absent from a polymerization process and/or polymerization catalyst, except for normal impurities. It is also preferred that a polymerization catalyst or catalyst system for a polymerization process herein consist essentially of the stated ingredients.

In all of the nickel complexes herein, except those specifically enumerated as nickel [0] complexes, it is preferred that the nickel be in the +2 oxidation state.

In the Examples the following abbreviations are used:

BAF--{tetrakis[3,5-bis(trifluoromethyl)phenyl]borate}

Bu--butyl

COD--θ⁴ -1,5-cyclooctadiene

Cy--cyclohexyl

DSC--differential scanning calorimetry

Et--ethyl

Me--methyl

Ph--phenyl (C₆ H₅ --)

RT--room temperature

Tg--glass transition temperature

THF--tetrahydrofuran

TLC--thin layer chromatography

Tm--melting point

In the Examples, all ethylene pressures are gauge pressures unless otherwise noted. The formulas given for the nickel complexes of specific ligands in the Examples may not be accurate and are for illustration purposes only. They represent the best estimate of the structure (or one of several possible structures) based on available data.

EXAMPLE 1

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (VI) (0.023 g, 0.06 mmol) (purchased from the SALOR fine chemical division of Aldrich Chemical Co.) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was washed with methanol and dried; yield of polymer =9.1 g. ¹ H NMR (CDCl₂ CDCl₂, 120° C.) showed that this sample contained 90 methyl-ended branches per 1000 methylenes. Two melting points were observed by differential scanning calorimetry: a very broad melting point centered at approximately 0° C., and a sharp melting point at 115° C. ##STR18##

EXAMPLE 2

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (VII) (0.023 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =4.9 g. By ¹ H NMR integration it was shown that this material was branched polyethylene containing 109 methyl-ended branches per 1000 methylenes. ¹ H NMR (CDCl₃) d 1.24 (s, methylene and methine protons), 0.82 (d, methyls). ##STR19##

EXAMPLE 3

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (VIII) (0.024 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.26 g. ¹ H NMR (C₆ D₃ Cl₃, 120° C.) showed that this sample contained 18 methyl-ended branches per 1000 methylenes. ##STR20##

EXAMPLE 4

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (IX) (0.020 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was washed with methanol and dried; yield of polymer =0.73 g. T_(m) =126.9° C. (second heat) as determined by DSC. ¹ H NMR (CDCl₂ CDCl₂, 25° C.) showed that this sample contained approximately 7 methyl-ended branches per 1000 methylenes. ##STR21##

EXAMPLE 5

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (X) (0.030 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was washed with methanol and dried; yield of polymer =1.40 g. T_(m) =123.6° C. as determined by DSC. ¹ H NMR (CDCl₂ CDCl₂, 120° C.) showed that this sample contained approximately 10 methyl-ended branches per 1000 methylenes. ##STR22##

EXAMPLE 6

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (XI) (0.029 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.43 g. ¹ H NMR (CDCl₂ CDCl₂, 120° C.) showed that this sample contained 19 methyl-ended branches per 1000 methylenes. ##STR23##

EXAMPLE 7

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and 2,6-diisopropylaniline (0.011 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.72 g. T_(m) =121.3° C. (second heat) as determined by DSC. ¹ H NMR (C₆ D₃ Cl₃, 120° C.) showed that this sample contained 26 methyl-ended branches per 1000 methylenes. Another experiment run under identical conditions afforded 0.17 g of polymer; three other experiments in which 0.12 mmol of 2,6-diisopropylaniline were employed (other conditions the same as above) afforded 0.30 g, 0.20 g, and 0.64 g of polymer.

EXAMPLE 8

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and 2,6-diethylaniline (0.018 g, 0.12 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 14 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.34 g. T_(m) =122.5° C. (second heat) as determined by DSC.

EXAMPLE 9

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and aniline (0.011 g, 0.12 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 14 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.049 g. T_(m) =112.0° C. as determined by differential scanning calorimetry.

EXAMPLE 10

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and 1,8-diaminonaphthalene (0.010 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was washed with methanol and dried; yield of polymer =5.38 g. DSC on this sample showed a very broad melting point, T_(m) =37.0° C. (second heat).

EXAMPLE 11

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (XII) (0.016 g, 0.12 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h; during this time the temperature inside the reactor varied between 25 and 33° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.13 g. T_(m) =119.3, 129.0° C. as determined by DSC. ##STR24##

EXAMPLE 12

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and ortho-phenylenediamine (0.013 g, 0.12 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.052 g. T_(m) =98.0, 119.0° C. as determined by DSC.

EXAMPLE 13

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (XIII) (0.013 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h at 25° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.76 g. ##STR25##

EXAMPLE 14

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (XIV) (0.030 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h; during this time the temperature inside the reactor varied between 25 and 33° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =0.039 g. T_(m) =126.2° C. as determined by DSC. ##STR26##

EXAMPLE 15

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and anthranilic acid (0.008 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h; during this time the temperature inside the reactor varied between 25 and 39° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =1.74 g. T_(m) =118.4° C. as determined by DSC.

EXAMPLE 16

Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and compound (XXXVIII) (0.008 g, 0.06 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution was immediately frozen inside a 40 mL shaker tube glass insert. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere. The reaction mixture was agitated under 6.9 MPa C₂ H₄ for 18 h; during this time the temperature inside the reactor varied between 25 and 34° C. The final reaction mixture contained polyethylene, which was filtered off, washed with methanol and dried; yield of polymer =1.20 g. T_(m) =120.2, 132.3° C. as determined by DSC. ##STR27##

EXAMPLE 17 Synthesis of (VII)

2,6-diisopropylaniline (17.7 g, 100 mmol), 1,2-dibromoethane (9.4 g, 50 mmol), and diisopropylethylamine (20 mL) were heated to reflux for 2 days. Excess diisopropylethylamine was removed from the white crystals in vacuo, and the residue was washed with CH₂ Cl₂. The CH₂ Cl₂ was evaporated to give a red-brown residue. The crude product was recrystallized from methanol to afford white crystals of (VII).

EXAMPLE 18 Synthesis of (IX)

2,6-Diisopropylaniline (0.89 g, 5.0 mmol) and pentafluorobenzaldehyde (0.98 g, 5.0 mmol) were dissolved in CH₂ Cl₂ (20 mL) and the reaction mixture was stirred overnight at room temperature. The solvent was removed in vacuo to afford 1.5 g of (IX) as an off-white solid.

EXAMPLE 19 Synthesis of (X)

1,1'-Biphenyl-2,2'-diylphosphorochloridite (0.251 g, 1.0 mmol) was dissolved in anhydrous diethyl ether (15 mL) under nitrogen. To this stirred solution was slowly added the sodium salt of salicylaldehyde-2,6-diisopropylanilineimine (0.303 g, 1.0 mmol) . The solution was stirred for one hour, and then filtered. The filtrate was evaporated to afford a yellow oil. The oil was redissolved in approximately 3-4 mL petroleum ether. Slow evaporation of the solution at room temperature gave yellow crystals of (X). ¹ H NMR (CDCl₃) d 8.55 (s, 1H, N═CH), 8.25 (d, 1H, H_(aryl)), 7.50-7.05 (mult, 15H, H_(aryl)), 2.95 (sept, 2H, CHMe₂), 1.15 (d, 12H, CHMe₂); ³¹ P NMR (CDCl₃) d 142.44. ##STR28##

The preparation of 1,1'-biphenyl-2,2'-diylphosphorochloridite can be found in the following references: WO 9303839, U.S. Pat. Nos. 4,769,498, and 4,688,651, and Cuny, G. D., et al., J. Am. Chem. Soc. vol. 115, p. 2066 (1993).

Salicylaldehyde-2,6-diisopropylanilineimine was prepared by stirring an equimolar mixture of salicylaldehyde and 2,6-diisopropylaniline in the presence of a catalytic amount of formic acid in methanol for several days at room temperature; the product was from pentane at -78° C. The sodium salt was prepared by reaction with sodium hydride in THF.

EXAMPLE 20 Synthesis of (XI)

Compound (X)I was prepared by the method of Example 19 from 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin and the sodium salt of salicylaldehyde-2,6-diisopropylanilineimine. ¹ H NMR (CDCl₃) d 8.20-7.00 (mult, 16H, N═CH and H_(aryl)), 2.80 (sept, 2H, CHMe₂), 1.03 (overlapping d's,CHMe₂, 12H); ³¹ P NMR (CDCl₃) d 128.8 ppm. ##STR29##

6-Chloro-6H-dibenz[c,e][1,2]oxaphosphorin was prepared according to a published procedure: Pastor, S. D., et al., Phosphorus and Sulfur vol. 31, p. 71 (1987).

EXAMPLE 21 Synthesis of (XIV)

1,1'-biphenyl-2,2'-diylphosphorochloridite (0.125 g, 0.50 mmol) was dissolved in 15 mL 1:1 anhydrous ether/tetrahydrofuran under nitrogen. To this stirred solution was added the sodium salt of N-(ortho-hydroxy)benzyl-2,6-diisopropylaniline (0.153 g, 0.50 mmol). Stirring was continued for another 5.5 hours before the solution was filtered. Evaporation of the filtrate afforded a nearly colorless oil. This material was redissolved in diethyl ether/petroleum ether (˜1:2), and the solution cooled to -40° C. A small amount of material precipitated from the solution and was removed. Slow evaporation of the solution afforded white crystals of compound XIV. ¹ H NMR (CDCl₃) d 7.60-7.00 (mult, 15H, H_(aryl)), 4.05 (s, 2H, CH₂), 3.40 ppm (br s, 1H, NH), 3.25 (sept, 2H, CHMe₂); 1.10 (d, 12H, CHMe₂). ##STR30##

N-(ortho-hydroxy)benzyl-2,6-diisopropylaniline was prepared by NaBH₄ reduction of salicylaldehyde-2,6-diisopropylanilineimine in CH₃ OH/CHCl₃ (chloroform was added to help solubilize the aniline starting material). The sodium salt of this compound was prepared by reaction with sodium hydroxide in tetrahydrofuran.

EXAMPLE 22 Synthesis of (VIII)

Compound (VIII) was prepared by reduction of N-(ortho-diisopropylphosphinoxy)benzyl-2,6-diisopropylanilineimine with 2 equivalents of i-Bu₂ AlH in toluene at 0° C., followed by warming to room temperature and a basic workup. ##STR31##

N-(ortho-diisopropylphosphinoxy )benzyl-2,6-diisopropylanilineimine was prepared by reaction of salicylaldehyde-2,6-diisopropylanilineimine with chlorodiisopropylphosphine and triethylamine in toluene at room temperature.

EXAMPLES 23-66

These Examples were all done by the same general procedure. Under a nitrogen atmosphere, Ni(COD)₂ (0.017 g, 0.06 mmol) and the ligand to be tested (0.06 or 0.12 mmol) were dissolved in benzene (5.0 mL). To the resulting solution was added HBAF' (Et₂ O)₂ (0.060 g, 0.06 mmol). The resulting solution inside a 40 mL shaker tube glass insert was immediately frozen in a freezer inside the glove box. The glass insert was transferred to a shaker tube, and its contents allowed to thaw under an ethylene atmosphere of 6.9 MPa. The reaction mixture was agitated under 6.9 MPa of ethylene pressure for about 18 h. Any polyethylene in the final reaction mixture was washed with methanol and dried. Melting points of some of the polymers were determined by DSC. These (when determined) along with polymer yields and other data are given in Table 1. The structures of the ligands (except if already shown above) are listed after Table 1.

                  TABLE 1                                                          ______________________________________                                         Ex.      Ligan   Ligand/     g PE Tm, ° C.                              ______________________________________                                           23 50 1.0 24.4 123                                                             24 51 2.0 15.5 139                                                             25 52 1.0 11.0 --                                                              26 53 2.0 10.2 124                                                             27 54 1.0 5.3 124                                                              28 55 2.0 4.6 125                                                              29 56 1.0 4.3 --                                                               30 57 1.0 4.0 136                                                              31 58 1.0 3.9 118                                                              32 59 1.0 3.6 --                                                               33 60 1.0 3.1 112                                                              34 61 1.0 3.0 124                                                              35 62 1.0 3.0 123                                                              36 63 1.0 2.9 128                                                              37 64 2.0 2.6 --                                                               38 65 1.0 2.1 --                                                               39 66 1.0 1.8 131                                                              40 67 1.0 1.7 118                                                              41 68 1.0 1.6 123                                                              42 69 1.0 1.5 --                                                               43 70 1.0 1.5 --                                                               44 (XIX) 1.0 1.4 121                                                           45 71 1.0 1.3 --                                                               46 (XXV) 1.0 1.3 126                                                           47 72 1.0 1.1 131                                                              48 73 1.0 1.0 --                                                               49 74 1.0 1.0 117                                                              50 74 1.0 .9 --                                                                51 77 1.0 .9 --                                                                52 77 1.0 .9 124                                                               53 78 1.0 .8 --                                                                54 79 2.0 .8 --                                                                55 80 2.0 .7 --                                                                56 81 1.0 .7 127                                                               57 82 1.0 .7  65                                                               58 83 2.0 .6 --                                                                59 (XVII 1.0 .6 --                                                             60 84 1.0 .6 --                                                                61 85 2.0 .6 --                                                                62 86 2.0 .5 --                                                                63 87 1.0 .5 --                                                                64 88 1.0 .5 --                                                                65 89 2.0 .5 --                                                                66 90 1.0 .4 --                                                              ______________________________________                                           #STR32##                                                                        -                                                                             #STR33##                                                                        -                                                                             #STR34##                                                                        -                                                                             #STR35##                                                                        -                                                                             #STR36##                                                                        -                                                                             #STR37##                                                                        -                                                                             #STR38##                                                                        -                                                                             #STR39##                                                                        -                                                                             #STR40##                                                                        -                                                                             #STR41##                                                                        -                                                                             #STR42##                                                                        -                                                                             #STR43##                                                                        -                                                                             #STR44##                                                                        -                                                                             #STR45##                                                                        -                                                                             #STR46##                                                                        -                                                                             #STR47##                                                                        -                                                                             #STR48##                                                                        -                                                                             #STR49##                                                                        -                                                                             #STR50##                                                                        -                                                                             #STR51##                                                                        -                                                                             #STR52##                                                                        -                                                                             #STR53##                                                                        -                                                                             #STR54##                                                                        -                                                                             #STR55##                                                                        -                                                                             #STR56##                                                                        -                                                                             #STR57##                                                                        -                                                                             #STR58##                                                                        -                                                                             #STR59##                                                                        -                                                                             #STR60##                                                                        -                                                                             #STR61##                                                                        -                                                                             #STR62##                                                                        -                                                                             #STR63##                                                                        -                                                                             #STR64##                                                                        -                                                                             #STR65##                                                                        -                                                                             #STR66##                                                                        -                                                                             #STR67##                                                                        -                                                                             #STR68##                                                                        -                                                                             #STR69##                                                                        -                                                                             #STR70##                                                                        -                                                                             #STR71##                                                                        -                                                                             #STR72##                                                                

Norbornene Polymerization

General procedure: The reactions were carried out in a dry, deoxygenated atmosphere. The catalyst was weighed into a 20 ml glass scintillation vial and a stir bar was added. A solution of dry dichloromethane/norbornene (3 ml, 43 mass % norbornene) was added and the resulting solutions stirred for 20-90 h. Each product was added to stirring methanol (in air) to precipitate the polymer. The polymer was filtered, washed with methanol/10% HCl solution and methanol and finally dried under vacuum. In each case purity was improved by redissolving the polymer in chloroform and reprecipitating with methanol. ¹ H-NMR (CDCl₃) confirmed that the products were addition polymers of norbornene. Details and results of these polymerization are given in Table 2. Structures of the catalysts used are shown after Table 2.

                  TABLE 2                                                          ______________________________________                                         Ex.                    Time,                                                                               %                                                    No. Catalyst mmol h Yield Comments                                           ______________________________________                                         67    91      0.050    20   >95%  Solution was solidified                             within 5 min.                                                             68 92 0.041 20 >95%  Solidified over several h                                 69 .sup. 93.sup.a 0.030 20 93% Exothermic, boiled                                   solvent                                                                   70 94 0.016 44 45% Viscosity increased over                                         several days                                                              71 .sup. 95.sup.a 0.036 20 >95%  Exothermic, solidified                             within 1 min                                                              72 96 0.010 20 94% Solidified over 1 h                                         73 98 0.039 20 85% No stirring after 20 min                                         (too viscous)                                                             74 99 0.019 20 88% Exothermic, solid within                                         10 sec                                                                    75 100  0.020 20 81% Exothermic, solid within                                       5 sec                                                                     76 101  0.041 20 >95%  Solidified overnight                                    77 102  0.018 20 87% Exothermic, solidified                                         rapidly                                                                 ______________________________________                                          .sup.a End groups visible in .sup.1 H NMR of polymer indicate lower            molecular weight                                                               ##STR73##                                                                      ##STR74##                                                                      ##STR75##                                                                      ##STR76##                                                                      ##STR77##                                                                      ##STR78##                                                                      ##STR79##                                                                      ##STR80##                                                                      ##STR81##                                                                      ##STR82##                                                                      ##STR83##                                                                      ##STR84##                                                                

EXAMPLES 78-85 Styrene Polymerization

General procedure: The reactions were carried out in a dry, deoxygenated atmosphere. The nickel containing catalyst was weighed into a 20 ml glass scintillation vial and a stir bar added. Dry dichloromethane (2 ml) followed by styrene (2 ml, filtered through alumina, phenothiazine inhibitor) was added and the resulting solutions shaken in the dark for 2 h. The products were added to stirring methanol (in air) to precipitate the polymer. The polymer was filtered, washed with methanol/10% HCl solution and methanol and finally dried under vacuum. Polymers were characterized using ¹³ CNMR (CDCl₃) which indicated that in eac case the product was enriched in racemic diad units relative to atactic polystyrene [for measuring tacticities of polystyrenes see Kawamura, et al., Macromol. Rapid Commun., vol. 15, p. 479-1994)]. Details of each polymerization and results are shown in Table 3. Structures of catalysts are shown after Table 2, above.

                  TABLE 3                                                          ______________________________________                                         Ex.                   %                                                          No. Catalyst mmol Yield Comments                                             ______________________________________                                         78   91        0.017  37%    Golden solution                                     79 92 0.016 >95%   Brown viscous solution                                      80 93 0.015 80% Rapid reaction, viscous brown                                      solution                                                                   81 95 0.017 71% Rapid, orange solution tums                                        brown, viscous                                                             82 96 0.006 6% Golden solution                                                 83 98 0.016 84% Boils solvent, dark red viscous                                    solution                                                                   84 101  0.016  5% Yellow solution                                              85 102  0.027 73% Yellow solution, rapidly became                                  viscous                                                                  ______________________________________                                    

EXAMPLES 86-94 Styrene/Norbornene Copolymerization

General procedure: The reactions were carried out in a dry, deoxygenated atmosphere. The catalyst was weighed into a 20 ml glass scintillation vial and dry dichloromethane (1 ml) and a stir bar added. A solution of dry dichloromethane (2 ml), styrene (2 ml, Aldrich Chemical Co., 99+%, filtered through alumina, phenothiazine inhibitor added) and 1.5 g norbornene (Aldrich Chemical Co., 99%) was added and the resulting solutions shaken in the dark for 20 h. The products were added to stirring methanol (in air) to precipitate the polymer. The polymer was filtered, washed with methanol/10% HCl solution and methanol and finally dried under vacuum.

¹ H-NMR(CDCl₃) indicated that in each case the product contained both styrene and norbornene. The absence of a resonance between 6.2 and 6.7 ppm (assigned to the ortho protons in chains of polystyrene) confirms that the product is a copolymer [see for instance A. Benaboura, et al., C. R. Acad. Sc. Paris, Ser. 2, vol. 301, p. 229 (1985)]. The absence of a polystyrene Tg in the DSC confirmed that the products are copolymers.

Details and results of these polymerization are found in Table 4. Structures of the nickel containing catalysts are shown after Table 2, above.

                  TABLE 4                                                          ______________________________________                                                              Polymer                                                     Ex.  mmol Yield Mol %                                                          No. Catalyst catalyst (g) styrene Comments                                   ______________________________________                                         86   91      0.019   0.72 g                                                                               <5%   Golden solution, sticky                              polymer                                                                   87 92 0.015 1.49 g 11.1% Brown solution, polymer                                    precipitated                                                              88 93 0.012 2.47 g 13.7% Exothermic, precipitated                                   after 5 min                                                               89 95 0.019 2.62 g 50.8% Orange solution turned                                     red, precipitated                                                         90 97 0.013 0.28 g <5% Brown solution, small                                        amount polymer                                                            91 98 0.019 2.93 g 41.4% Red solution, exothermic,                                  precipitated                                                              92 99 0.009 2.64 g 58.1% Exothermic, golden                                         solution, precipitated                                                    93 100  0.015 2.15 g 24.2% Gold solution,                                           exothermic, precipitated                                                  94 101  0.023 1.54 g  5.2% Yellow solution, polymer                                 precipitated                                                            ______________________________________                                    

EXAMPLES 95-107

Following the procedure of Examples 23-66, ethylene was polymerized. The results are reported in Table 5. The structures of the ligands are listed after Table 5.

                  TABLE 5                                                          ______________________________________                                         Ex. No.  Ligand        Ligand/Ni                                                                               g PE                                           ______________________________________                                            95 102 1.0 13.8                                                                96 103 1.0 11.6                                                                97 104 1.0 10.8                                                                98 105 1.0 4.3                                                                 99 106 1.0 1.8                                                                100 107 1.0 1.5                                                                101 108 1.0 1.4                                                                102 109 1.0 1.2                                                                103 110 1.0 0.9                                                                104 111 1.0 0.6                                                                105 112 1.0 0.4                                                                106 113 1.0 0.4                                                                107 114 1.0 0.2                                                              ______________________________________                                          ##STR85##                                                                      -                                                                              ##STR86##                                                                      ##STR87##                                                                      ##STR88##                                                                      ##STR89##                                                                      ##STR90##                                                                      ##STR91##                                                                      ##STR92##                                                                      ##STR93##                                                                      ##STR94##                                                                      ##STR95##                                                                      ##STR96##                                                                      ##STR97##                                                                

EXAMPLES 108-183

General Synthesis of Nickel Allyl Initiators. A mixture of one to two equiv. of the appropriate ligand, one equiv of NaBAF, and 0.5 equiv of [(allyl)Ni(m--X)]₂ (X═Cl or Br) was dissolved in Et₂ O. The reaction mixture was stirred for several h before being filtered. The solvent was removed in vacuo to yield the desired product. (The [(allyl)Ni(m--X)]₂ precursors were synthesized according to the procedures published in the following reference: Wilke, G., et al., Angew Chem. Int. Ed. Engl. 1996, 5, 151-164.) The following ¹ H and ¹ C spectroscopic assignments of the BAF counterion in CD₂ Cl₂ were invariant for different complexes and temperatures and are not repeated in the spectroscopic data for each of the cationic allyl complexes: [3,5-C₆ H₃ -(CF₃)₂ ]₄ ⁻ (BAF). ¹ H NMR (CD₂ Cl₂) d 7.74 (s, 8, H_(o)), 7.57 (s, 4, H_(p)); ¹³ C NMR (CD₂ Cl₂) d 162.2 (q, J_(CB) =37.4, C_(ipso)), 135.2 (C_(o)), 129.3 (q, J_(CF) =31.3, C_(m)), 125.0 (q, J_(CF) =272.5, CF₃), 117.9 (C_(p)).

General Procedure for the Screening of Ethylene

Polymerization by Nickel Allyl Initiators. In the drybox, a glass insert was loaded with the isolated allyl initiator synthesized by the above general procedure. The insert was cooled to -35° C. in the drybox freezer, 5 mL of solvent (typically C₆ D₆ or CDCl₃) was added to the cold insert, and the insert was then capped and sealed. Outside of the drybox, the cold tube was placed under 6.9 MPa of ethylene and allowed to warm to RT as it was shaken mechanically for approximately 18 h. An aliquot of the solution was used to acquire a ¹ H NMR spectrum. The remaining portion was added to -20 mL of MeOH in order to precipitate the polymer. The polyethylene was isolated and dried under vacuum.

EXAMPLE 108 ##STR98##

The general synthesis of nickel allyl initiators was followed using 64 mg of ligand, 53 mg of [(C₃ H₅)Ni(Cl)]₂, and 347 mg of NaBAF. A wheat yellow powder (307 mg) was isolated. ¹ H and ¹³ C NMR spectra are consistent with the above structure with one equiv of Et.sub. O present. In particular, at -80° C. two sets of amino proton resonances are observed and are coupled to each other. This is consistent with the above structure in which both nitrogen atoms are bound to nickel At room temperature (20° C.), one broad resonance is observed at 5.64 ppm for all of the amino protons: ¹ H NMR (CD₂ Cl₂, 300 MHz, -80° C.) d 7.81 (d, 2, J=8.09, H_(o) or H_(p)), 7.41 (t, 2, J=8.1, H_(m)), 7.26 (d, 2, J=6.74, H_(o) or H_(p)), 5.49 (m, 1, J=6.7, H₂ CCHCH₂), 5.43 (d, 2, J=10.8, NHH'), 5.04 (d, 2, J=12.14, NHH'), 3.38 (br q, 4, J=6.7, O(CH₂ CH₃)₂), 3.26 (d, 2, J=6.8 (HH'CCHCHH'), 2.17 (d, 2, J=13.5, HH'CCHCHH'), 0.92 (t, 6, J=6.1, O(CH₂ CH₃)₂); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt) d 136.1, 130.4, 129.0, 126.7, 123.2 and 121.7 (C_(aryl)), 115. (H₂ CCHCH₂), 65.9 (H₂ CCHCH₂), 55.7 (O(CH₂ CH₃)₂), 14.9 (O(CH₂ CH₃)₂).

EXAMPLE 109

The allyl initiator of Example 108 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 24 mg of catalyst. Polyethylene was isolated (304 mg).

EXAMPLE 110 ##STR99##

The general synthesis of nickel allyl initiators was followed using 151 mg of ligand, 205 mg of [(H₂ CCHCHPh)Ni(Cl)]₂, and 860 mg of NaBAF A yellowbrown powder (694 mg) was isolated. The ¹ H NMR spectrum indicates that one equiv of Et₂ O is present. The spectrum, particularly the observation of 4 inequivalent coupled amino protons, is consistent with the above structure in which both nitrogen atoms are boun to nickel. The amino resonances remain inequivalent at least up to 60° C.: ¹ H NMR (CD₂ Cl₂, 300 MHz, -40° C.) 7.85-7.25 (m, 10, H_(aryl)), 6.47 (d, 1, J=6.8, H_(aryl)), 6.03 (t of d, 1, J=12.8, 7.2, H₂ CHCHPh), 5.17 (d, 1, J=10.8, NHH'), 4.89 (d, 1 J=10.8, NHH'), 4.23 (d, 1, J=12.1, N'HH'), 3.73 (d, 1, J=12.1, H₂ CHCHPh), 3.66 (d, 1, J=10.8, N'HH'), 3.41 (q, 4, J=7.2, O(CH₂ CH₃)₂), 3.34 (d, 1, J=6.8, HH'CHCHPh), 2.31 (d, 1, J=12.1, HH'CCHCHPh), 1.05 (t, 6, J=7.4, O(CH₂ CH₃)₂).

EXAMPLE 111

The allyl initiator of Example 1110 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 67 mg of catalyst. No polyethylene was isolated under these conditions. However, the ¹ H NMR spectrum of the reaction mixture indicated that butenes and higher olefins were produced in significant amounts.

EXAMPLE 112 ##STR100##

The general synthesis of nickel allyl initiators was followed using 202 mg of ligand, 127 mg of [(C₃ H₅)Ni(Cl)]₂, and 829 mg of NaBAF A yelloworange powder (967 mg) was isolated. The NMR spectra are consistent with the structure shown above, in which both nitrogen atoms coordinate to nickel. ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 7.8 (d of d, 2, J=5.9, 3.3, H_(m)), 7.56 (s, 2, H_(o) or H_(p)), 7.54 (d, 2, J=2.9, H_(o) or H_(p)), 6.10 (t of t, 1, J=13.4, 7.1, H₂ CCHCH₂), 3.23 (d, 2, J=7.3, HH'CCHCHH'), 3.1 (br, 12, 2×NMe₂), 2.58 (d, 2, J=13.2, HH'CCHCHH'); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt, nonaromatic carbons only) d 117.6 (H.sub. CCHCH₂), 60.2 (H₂ CCHCH₂), 55.1 (br, NMe₂).

EXAMPLE 113

The allyl initiator of Example 112 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure (with the exception that 4.1 MPa of ethylene was used) using 40 mg of catalyst. Polyethylene was not isolated. The ¹ H NMR spectrum showed the production of butenes and a small amount of higher olefins.

EXAMPLE 114 ##STR101##

The general synthesis of nickel allyl initiators was followed using 103 mg of ligand, 100 mg of [(H₂ CCHCMe₂)Ni(Br)]₂, and 427 mg of NaBAF. A pale pink powder (517 mg) was isolated. The NMR spectrum is consistent with the structure shown above, in which both nitrogen atoms coordinate to nickel. ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 8.2-7.4 (m, 6, H_(aryl)), 5.33 (dd, 1, J=12.8, 7.4, H₂ CCHCMe₂), 3.35-2.80 (br, 12, NMeMe', N'MeMe'), 2.78 (dd, 1, J=8.1, 2.7, HH'CHCMe₂), 1.75 (dd, 1, J=13.5, 2.7, HH'CHCMe₂), 1.22 and 0.73 (s, 3 each, H₂ CCHCMeMe').

EXAMPLE 115

The allyl initiator of Example 114 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 66 mg of catalyst. Polyethylene was isolated (23 mg).

EXAMPLE 116

The allyl initiator of Example 114 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 62 mg of catalyst. No polyethylene was isolated; however, the ¹ H NMR spectrum of the reaction mixture showed the production o butenes, higher olefins, and a broad (CH₂)_(n) peak at 1.25 ppm.

EXAMPLE 117 ##STR102##

The general synthesis of nickel allyl initiators was followed using 135 mg of ligand, 48 mg of [(C₃ H₅)Ni(Cl)]₂, and 307 mg of NaBAF. A yellow powder (394 mg) was isolated. The ¹ H and ¹³ C NMR spectra are consistent with both nitrogen atoms coordinating to nickel, a shown above, with the aryl rings lying trans to each other in the majorit of the product. Other isomers may be present in lesser amounts: ¹ H NMR (CD₂ Cl₂, 300 MHz, -40° C.) d 7.4-7.0 (m, 6, H_(aryl)), 5.68 (m, 1, H₂ CCHCH₂), 5.53, 5.38, 4.84 and 4.22 (m, 1 each, NCHH'C'HH'N'), 3.4-2.8 (m, 6, NH, N'H, CHMe₂, C'HMe₂, C"HMe₂, C"'HMe₂), 2.73 (d, 1, J=6.7, HH'CCHCHH'), 2.62 (d, 1, J=6.8, HH'CCHCHH'), 2.39 (d, 1, J=13.5, HH'CCHCHH'), 1.55 (d, 1, J=13.5, HH'CCHCHH'), 1.8-1.2 (d, 3 each, CHMeMe', C'HMeMe', C"HMeMe', C"'HMeMe'); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt) d 140.9, 140.8, 139.9, 139.4, 138.9 and 138.4 (Ar: C_(ipso), C_(o), C_(o) ' and Ar' C_(ipso), C_(o), C_(o) '), 129.0, 128.8, 127.1, 127.0, 125.4 and 125.1 (Ar: C_(m), C_(m) ', C_(p) and Ar': C_(m), C_(m) ', C_(p)), 116.1 (H₂ CCHCH₂), 60.7, 55.9, 54.3 and 53.0 (H₂ CCHC'H₂, NCH₂ C'H₂ N'), 31.7, 30.5, 30.0 and 29.4 (CHMe₂, C'HMe₂, C"HMe₂, C"'HMe₂), 26.4, 26.0, 24.4, 24.2, 24.2, 24.2, 24.0 and 22.9 (CHMeMe', C'HMeMe', C"HMeMe', C"'HMeMe').

EXAMPLE 118

The allyl initiator of Example 117 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 63 mg of catalyst. Polyethylene (3.49 g) was isolated. ¹ H NMR spectrum of the isolated polymer indicates the formation of branched polyethylene with roughly 100 methyl branches per 1000 carbon atoms.

EXAMPLE 119

The allyl initiator of Example 117 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 68 mg of catalyst. Polyethylene (1.69 g) was isolated.

EXAMPLE 120 ##STR103##

The general synthesis of nickel allyl initiators was followed using 106 mg of ligand, 53 mg of [(C₃ H₅)Ni(Cl)]₂, and 349 mg of NaBAF. A yellow powder (394 mg) was isolated. The ¹ H and ¹³ C NMR spectra are consistent with both nitrogen atoms coordinating to nickel, a shown above, with the aryl rings lying trans to each other in the majorit of the product. Other isomers may be present in lesser amounts: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 8.3-7.2 (m, 10, H_(aryl)), 5.9 (m, 1, H₂ CCHCH₂), 3.9-2.8 (m, 10, HH'CCHCHH', NCH₂ CH₂ N', NCH₂ CH₃, N'CH₂ CH₃), 2.49 (d, 1, J=13.6 HH'CCHCHH'), 2.15 (d, 1, J=13.6, HH'CCHCHH'), 1.36 and 1.17 (t, 3 each, J=7.2, NCH₂ CH₃ and N'CH₂ CH₃); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt) d 150.1 and 147.5 (Ph: C_(ipso) and Ph' C_(ipso)), 130.8, 130.8, 130.8, 130.7, 129.2, 128.9, 128.2, 124.0, 123. and 122.6 (Ph: C_(o),C_(o) ', C_(m), C_(m) ' and C_(p) ; Ph': C_(o), C_(o) ', C_(m), C_(m) ' and C_(p)), 115.6 (H₂ CCHCH₂), 59.6, 58.7, 58.3, 57.9, 57.3 and 56.4 (H₂ CCHCH₂, NCH₂ CH₃, N'CH₂ CH₃, NCH₂ CH₂ N'), 12.6 and 11.8 (NCH₂ CH₃ and N'CH₂ CH₃).

EXAMPLE 121

The allyl initiator of Example 120 was used to polymerize ethylene in CDCl₃ at 60° C. according to the general polymerization procedure using 25 mg of catalyst. A few mg's of soft white polyethylene was isolated; the ¹ H NMR spectrum of this product shows branched polyethylene peaks at 1.25 ppm (CH₂) and 0.85 ppm (CH₃).

EXAMPLE 122 ##STR104##

The general synthesis of nickel allyl initiators was followed using 95 mg of ligand, 34 mg of [(C₃ H₅)Ni(Cl)]₂, and 218 mg of NaBAF. A yellow powder (231 mg) was isolated. The ¹ H NMR spectrum is complex with more than one isomer apparently present.

EXAMPLE 123

The allyl initiator of Example 122 was used to polymerize ethylene in CDCl₃ at 60° C. according to the general polymerization procedure using 22 mg of catalyst. A few mgls of polyethylene was isolated; the ¹ H NMR spectrum of this product shows a --(CH₂)- peak at 1.2 ppm. The ¹ H NMR spectrum of the reaction mixture shows the production of butenes; branched polyethylene peaks are also observabl at 1.25 ppm (CH₂) and 0.85 ppm (CH₃).

EXAMPLE 124 ##STR105##

The general synthesis of nickel allyl initiators was followed using 213 mg of ligand, 54 mg of [(C₃ H₅)Ni(Cl)]₂, and 354 mg of NaBAF. An orange powder (391 mg) was isolated. Variabletemperature ¹ H NMR and ¹³ C NMR spectra are consistent with the above structure in whic one methoxy group and the phosphorus atom are coordinated to nickel. ¹ H NMR spectral data are reported at both -100° C. and 20° C. Four resonances for the allyl syn and anti protons are observed at -100° C., while two resonances are observed at RT for these protons. The observation of the four syn and anti protons at -100° C. supports probable coordination of the methoxy group to nickel: ¹ H NMR (CD₂ Cl₂, 300 MHz, -100° C.) d 6.05 (d, 6, J_(HP) =4.1, C_(m)), 5.59 (m, 1, H₂ CCHCH₂), 3.89 (d 1, J=6.75, HH'CHC'HH'), 3.76 (s, pOMe), 3.67 (s, oOMe), 3.07 (br s, 1, HH'CHC'HH'), 2.93 (dd, 1, J=13.5, 5.4, HH'CHCHH'), 1.74 (d, 1, J=12.1, HH'CCHCHH'); ¹ H NMR (CD₂ Cl₂, 300 MHz, 20° C.) d 6.13 (d, 6, J_(HP) =2.7, C_(m)), 5.62 (m, 1, H₂ CCHCH₂), 3.81 (s, pOMe), 3.71 (s, oOMe), 3.49 (d, 2, J=6.8, HH'CHCHH'), 2.42 (d, 2 J=16.2, HH'CHCHH'); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt) d 164.0 (C_(p)), 162.4 (d, J_(CP) =4.9, C_(o)), 113.7 (H₂ CCHCH₂) 97.8 (d, J_(CP) =60.4, C_(ipso) to P), 91.1 (d, J=4.9, C_(m)), 57.8 (H₂ CCHCH₂ and oOMe, overlapping), 55.4 (pOMe).

EXAMPLE 125

The allyl initiator of Example 124 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 28 mg of catalyst. Butenes were formed according to ¹ H NMR spectroscopy.

EXAMPLE 126

The allyl initiator of Example 124 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 28 mg of catalyst. Butenes and some higher olefins were formed according to ¹ H NMR spectroscopy.

EXAMPLE 127 ##STR106##

The general synthesis of nickel allyl initiators was followed using 501 mg of ligand, 224 mg of [(H₂ C(CO₂ Me)CH₂)Ni(Br)]₂, and 834 mg of NaBAF. A yellowgreen powder (391 mg) was isolated. ¹ H NMR spectrum of product is complex; the structure shown above is tentatively assigned by analogy to the parent (C₃ H₅) allyl complex.

EXAMPLE 128

The allyl initiator of Example 127 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 93 mg (0.06 mmol) of catalyst and 2 equiv (29 mg) of BPh₃ cocatalyst. Polyethylene (177 mg) was isolated.

EXAMPLE 129

The allyl initiator of Example 127 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 93 mg (0.06 mmol) of catalyst and 2 equiv (61 mg) of B(C₆ F₃)₃ cocatalyst. Polyethylene (90 mg) was isolated.

EXAMPLE 130 ##STR107##

The general synthesis of nickel allyl initiators was followed using 45 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A yellow powder (334 mg) was isolated. The ¹ H NMR spectral data is consistent with the structure shown above: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 8.46 (d, 1, J=5.4, H_(aryl)), 8.17 (t, 1, J=8.1, H_(aryl)), 7.84 (d, 1, J=8.1, H_(aryl)), 7.74 (m, 1, H_(aryl), overlaps with BAF: H_(o)), 7.10 and 6.82 (br s, 1 each NHH'), 5.99 (m, 1, H₂ CCHCH₂), 3.57 (d, 2, J=6.8, HH'CCHCHH'), 2.66 (d, 2, J=13.5, HH'CCHCHH'). ¹³ C NMR (CD₂ Cl₂, 75 MHz rt) d 173.5 (C═O), 146.4 (Caryl: C--C(O)NH₂), 153.7, 141.4, 131. and 123.9 (C_(aryl) attached to hydrogen), 117.2 (H₂ CCHCH₂), (H₂ CCHCH₂ overlaps with CD₂ Cl₂ resonance).

EXAMPLE 131

The allyl initiator of Example 130 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 63 mg of catalyst. A few mg's of polyethylene was isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced. Polyethylene --CH₂ -- resonance is identifiable at 1.25 ppm.

EXAMPLE 132

The allyl initiator of Example 130 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 64 mg of catalyst. Polyethylene (247 mg) was isolated. According to the ¹ H NMR spectrum of the reaction mixture, the reaction was productive in the formation of butenes and higher olefins.

EXAMPLE 133 ##STR108##

The general synthesis of nickel allyl initiators was followed using 52 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A yellow powder (328 mg) was isolated. The ¹ H NMR spectral data is consistent with the structure shown above: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 11.34 (br s, 1, OH), 8.54 (br s, 1, NHH'), 7.99 (d, 1, J=4.0, H_(aryl)), 7.64 (d, 1, J=8.1, H_(aryl)) 7.55 (t, 1, J=4.7, H_(aryl)), 6.76 (br s, 1, NHH'), 5.95 (m, 1, HH'CCHCHH'), 3.40 (br, HH'CCHCHH', 2.58 (br, HH'CCHCHH'). ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt, assignments aided by an APT spectrum) δ 173.7 (CO), 155.9 and 133.8 (C_(aryl) not attached to hydrogen), 145.8, 132.3 and 129.3 (C_(aryl) attached to hydrogen), 116.6 (H₂ CCHCH₂), (H₂ CCHCH₂ resonances not observed Neither overlapping with CD₂ Cl₂ resonance or broad and in the baseline).

EXAMPLE 134

The allyl initiator of Example 133 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 60 mg of catalyst. Polyethylene (190 mg) was isolated as a white powder.

EXAMPLE 135

The allyl initiator of Example 133 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 60 mg of catalyst. Polyethylene (783 mg) was isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced.

EXAMPLE 136 ##STR109##

The general synthesis of nickel allyl initiators was followed using 57 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A yellow powder (264 mg) was isolated. The ¹ H, ¹³ C, and APT NMR spectral data is consistent with the structure shown above: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 14.0 (br s, 1, OH), 8.10 (d, 1, J=8.1, H_(aryl)), 7.65 (t, 1, J=8.1, H_(aryl)), 7.47 (t, 1, J=8.1, H_(aryl)), 7.21 (d, 1, J=8.1, H_(aryl)), 5.83 (m, 1, H₂ CCHCH₂), 4.34 (br s, 2, NH₂), 3.23 (br d, 2, J=5.4, HH'CCHCHH') 2.34 (br d, 2, J=13.49, HH'CCHCHH').

EXAMPLE 137

The allyl initiator of Example 136 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 63 mg of catalyst. Polyethylene was not isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes an higher olefins were produced.

EXAMPLE 138 ##STR110##

The general synthesis of nickel allyl initiators was followed using 83 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A red powder (381 mg) was isolated. ¹ H NMR (CD₂ Cl₂, 300 MHz, rt): The complex formed a clear red solution in CD₂ Cl₂ with no precipitate present. However, the lock signal and spectrum were both broad, possibly indicating paramagnetism. The above structure is tentatively assigned by analogy to diamagnetic complexes containing ligands with similar donor functionality.

EXAMPLE 139

The allyl initiator of Example 138 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 63 mg of catalyst. Polyethylene (88 mg) was isolated.

EXAMPLE 140

The allyl initiator of Example 138 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 60 mg of catalyst. Polyethylene (64 mg) was isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced.

EXAMPLE 141 ##STR111##

The general synthesis of nickel allyl initiators was followed using 135 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. An orange powder (403 mg) was isolated. The ¹ H, ¹³ C, and APT NMR spectral data for the major product follows and is consistent with on isomer of the above structure. Other isomers may be present in lesser amounts: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 9.77 and 8.83 (s 1 each, N═CH and H_(aryl)), 9.0-7.5 (m, 8, H_(aryl)), 6.91 and 6.63 (br s, 1 each, NHH'), 4.6 (br s, 1, H₂ CCHCH₂), 3.5-2.3 (broad resonances in the baseline, HH'CCHCHH'). ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt, assignments aided by an APT spectrum) d 173.7 (N═CH), 172.9 (CO), 147.4, 131.6, 131.0, 126.5 and 124.7 (C_(aryl) not attached to hydrogen), 136.8, 133.7, 130.3, 130.2, 129.5, 129.3, 127.0, 123.3 and 122.7 (C_(aryl) attached to hydrogen), 113.8 (H₂ CCHCH₂), (H₂ CCHCH₂ resonances were not observedNeither overlapping with CD₂ Cl₂ resonance or broad and in the baseline).

EXAMPLE 142

The allyl initiator of Example 141 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 68 mg of catalyst. Polyethylene (1.60 g) was isolated as a wax.

EXAMPLE 143

The allyl initiator of Example 141 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 60 mg of catalyst. Polyethylene (5.64 g) was isolated as wax.

EXAMPLE 144 ##STR112##

The general synthesis of nickel allyl initiators was followed using 123 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A yellow powder (383 mg) was isolated. The ¹ H NMR spectrum is consistent with the above structure, although contamination by free ligan is indicated: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt, iPr and allyl resonances only) d 5.97 (m, 1, H₂ CCHCH₂), 3.76 (br septet and br d, 1 each, CHMe₂ and HH'CHCHH'), 3.53 (br d, 1, J˜5.5, HH'CCHCHH'), 3.35 (br septet, 1, C'HMe₂), 2.53 (br d, 1, J=13.6, HH'CCHCHH'), 2.20 (br d, 1, J=13.6, HH'CCHCHH'), 1.45, 1.43, 1.29 and 1.1 (d, 3 each, J=6.6-7.7, CHMeMe' and C'HMeMe').

EXAMPLE 145

The allyl initiator of Example was 144 used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 40 mg of catalyst. Polyethylene (30 mg) was isolated as a white powder. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced. Minor resonances consistent with the formation of branched polyethylene are present.

EXAMPLE 146

The allyl initiator of Example 144 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 64 mg of catalyst. Polyethylene (96 mg) was isolated as a white powder. The ¹ H NMR spectrum shows the production of butenes and higher olefins. Polyethylene --CH₂ -- resonance is identifiable at 1.25 ppm.

EXAMPLE 147 ##STR113##

The general synthesis of nickel allyl initiators was followed using 532 mg of ligand, 229 mg of [(C₃ H₅)Ni(Cl)]₂, and 1.50 of NaBAF. 1.85 g of a yellow powder was isolated. Although the free ligand exists a the amine, the ¹ H and ¹³ C NMR spectra are consistent with the ligand binding to the molecule as the imine: ¹ H NMR (THFd₈, 30 MHz, rt) d 8.75 (br s, 2, NH₂), 8.55 (d, 1, J=5.4, N═CH), 7.9-7. (m, 14, H_(aryl)), 5.56 (d, 1, J=5.4, CHPh₂), 5.52 (m, 1, H₂ CCHCH₂), 3.01 (d, 2, J=6.7, HH'CCHCHH'), 2.01 (d, 2, J=13.5, HH'CCHCHH'); ¹³ C NMR (THFd₈, 75 MHz, rt, nonaromatic carbons only, assignments aided by APT spectrum) d 181.7 (N═CH), 172.8 (C═O), 113.8 (H₂ CCHCH₂), 58.7 (CHPh₂), 54.5 (H₂ CCHCH₂).

EXAMPLE 148

The allyl initiator of Example 147 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 40 mg of catalyst. Polyethylene (25 mg) was isolated as a white powder. According to the ¹ H NMR spectrum of the reaction mixture, butenes were formed along with higher olefins; the major product is consistent with branched polyethylene [1.25 (CH₂), 0.85 (CH₃)] with approximately 100 methylended branches per 1000 carbon atoms.

EXAMPLE 149

The allyl initiator of Example 147 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 75 mg of catalyst. Polyethylene (588 mg) was isolated as a white powder.

EXAMPLE 150

The allyl initiator of Example 147 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 61 mg of catalyst. Polyethylene (1.39 g) was isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced. A significant polyethylene --CH₂ -- peak appears at 1.25 ppm.

EXAMPLE 151 ##STR114##

The general synthesis of nickel allyl initiators was followed using 255 mg of ligand, 105 mg of [(C₃ H₅)Ni(Cl)]₂, and 685 mg of NaBAF 772 mg of a pale green powder was isolated.

EXAMPLE 152

The allyl initiator of Example 151 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 45 mg of catalyst. Polyethylene (1.61 g) was isolated as a white powder.

EXAMPLE 153

The allyl initiator of Example 151 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 62 mg of catalyst. Polyethylene (93 mg) was isolated as a white powder. The ¹ H NMR spectrum shows the production of butenes and higher olefins. Polyethylene --CH₂ -- resonance is identifiable at 1.25 ppm.

EXAMPLE 154

The allyl initiator of Example 151 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 67 mg of catalyst. Polyethylene (169 mg) was isolated. According to the ¹ H NMR spectrum of the reaction mixture, the reaction was productive in the formation of butenes and higher olefins. Polyethylene --CH₂ -- resonance is identifiable at 1.25 ppm.

EXAMPLE 155 ##STR115##

The general synthesis of nickel allyl initiators was followed using 213 mg of ligand, 295 mg of [(H₂ CC(CO₂ Me)CH₂)Ni(Br)]₂, and 795 mg of NaBAF. A gold powder (0.792 g) was isolated.

EXAMPLE 156

The allyl initiator of Example 155 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 61 mg of catalyst. Polyethylene (1.97 g) was isolated as a white powder.

EXAMPLE 157 ##STR116##

The general synthesis of nickel allyl initiators was followed using 657 mg of ligand, 238 mg of [(H₂ CCHCMe₂)Ni(Br)]₂, and 1.56 of NaBAF. A red powder (1.88 g) was isolated. Although the free ligand exist as the amine, the ¹ H and ¹³ C NMR spectra are consistent with the ligand binding to the molecule as the imine: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 8.41 (d, 1, J=5.4, N═CH), 7.8-6.8 (m, 17, H_(aryl)), 5.42 (d, 1, J=5.4, CHPh₂), 4.80 (dd, 1, J=12.8, 6.9, H₂ CCHCMe₂), 2.95 (d, 1, J=6.7, HH'CCHCMe₂), 2.03 (d, 1, J=13.5, HH'CCHCMe₂), 0.77 (s, 6, H₂ CCHCMeMe'); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt, nonaromatic carbons only, assignments aided by APT spectrum) d 202.4 (C═O), 182.6 (N═CH), 109.1 (H.sub. CCHCMe₂), 59.7 (CHPh₂), 53.2 (H₂ CCHCMe₂), 43.1 (H₂ CCHCMe₂), 26.0 and 20.8 (H₂ CCHCMeMe').

EXAMPLE 158

The allyl initiator of Example 157 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 61 mg of catalyst. According to the ¹ H NMR spectrum, significant amounts of butenes and higher olefins were produced.

EXAMPLE 159

The allyl initiator of Example 157 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 63 mg of catalyst. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefin were produced.

For Examples 160-177 where the ligands are thiophene and furan derivatives the ¹ H NMR spectra of the products are, in general, complex and include more than one species. The structural assignments of these complexes are therefore tentative.

EXAMPLE 160 ##STR117##

The general synthesis of nickel allyl initiators was followed using 115 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. A sticky darkred solid (185 mg) was isolated.

EXAMPLE 161

The allyl initiator of Example 160 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure (with the exception that 5.2 MPa of ethylene was used) using 57 mg of catalyst. Polyethylene was not isolated. According to the ¹ H NMR spectrum of the reaction mixture, significant amounts of butenes and higher olefins were produced.

EXAMPLE 162 ##STR118##

The general synthesis of nickel allyl initiators was followed using 173 mg of ligand, 87 mg of [(C₃ H₅)Ni(Cl)]₂, and 570 mg of NaBAF. An orange powder (705 mg) was isolated.

EXAMPLE 163

The allyl initiator of Example 162 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 64 mg of catalyst. Polyethylene (72 mg) was isolated. The ¹ H NMR spectrum of the reaction mixture indicates that significant amounts of butenes and higher olefins were produced.

EXAMPLE 164

The allyl initiator of Example 162 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 68 mg of catalyst. Polyethylene (77 mg) was isolated. The ¹ H NMR spectrum of the reaction mixture indicates that significant amounts of butenes and higher olefins were produced.

EXAMPLE 165 ##STR119##

The general synthesis of nickel allyl initiators was followed using 65 mg of ligand, 50 mg of [(H₂ CCHCMe₂)Ni(Br)]₂, and 213 mg of NaBAF. An orange powder (163 mg) was isolated.

EXAMPLE 166

The allyl initiator of Example 165 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 40 mg of catalyst. Polyethylene (823 mg) was isolated as a white powder.

EXAMPLE 167

The allyl initiator of Example 165 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 63 mg of catalyst. Polyethylene was not isolated, however the ¹ H NMR spectrum of the reaction mixture indicates that significant amounts of butenes and higher olefins were formed.

EXAMPLE 168 ##STR120##

The general synthesis of nickel allyl initiators was followed using 311 mg of ligand, 274 mg of [(H₂ CC(CO₂ Me)CH₂)Ni(Br)]₂, and 1.02 g of NaBAF. An orange powder (1.30 g) was isolated.

EXAMPLE 169

The allyl initiator of Example 168 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 77 mg of catalyst and 1 equiv (31 mg) of B(C₆ F₅)₃ cocatalyst. Polyethylene (188 mg) was isolated as a waxy solid. The ¹ H NMR spectrum of the reaction mixture indicates that significant amounts of butenes and higher olefins were produced; the polyethylene --CH₂ -- resonance is identifiable at 1.25 ppm.

EXAMPLE 170 ##STR121##

The general synthesis of nickel allyl initiators was followed using 323 mg of ligand, 153 mg of [(C₃ H₅)Ni(Cl)]₂, and 1.00 g of NaBAF An orange powder (1.22 g) was isolated.

EXAMPLE 171 ##STR122##

The general synthesis of nickel allyl initiators was followed using 329 mg of ligand, 239 mg of [(H₂ CCHCMe₂)Ni(Br)]₂, and 1.02 mg of NaBAF. A sticky red solid (742 mg) was isolated.

EXAMPLE 172

The allyl initiator of Example 171 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 77 mg of catalyst. Polyethylene (100 mg) was isolated. The ¹ H NMR spectrum of the reaction mixture indicates that significant amounts o butenes and higher olefins were produced.

EXAMPLE 173 ##STR123##

The general synthesis of nickel allyl initiators was followed using 327 mg of ligand, 272 mg of [(C₃ H₅)Ni(Cl)]₂, and 1.01 g of NaBAF An orange powder (1.42 g) was isolated.

EXAMPLE 174

The allyl initiator of Example 173 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 78 mg of catalyst and 2 equiv (29 mg) of BPh₃ cocatalyst. Polyethylene was not isolated. The ¹ H NMR spectrum of the reaction mixture indicates that significant amounts of butenes and higher olefins were produced.

EXAMPLE 175

The allyl initiator of Example 173 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 78 mg of catalyst and 1 equiv (31 mg) of B(C₆ F₅)₃ cocatalyst. Polyethylene (2.39 g) was isolated.

EXAMPLE 176 ##STR124##

The above general procedure for nickel allyl initiators was followed using 62 mg of ligand, 50 mg of [(H₂ CCHCMe₂)Ni(Br)]₂, and 213 m of NaBAF. An orange powder (188 mg) was isolated.

EXAMPLE 177

The allyl initiator of Example 176 was used to polymerize ethylene in CDCl₃ at RT according to the general polymerization procedure using 40 mg of catalyst. No polyethylene was isolated.

EXAMPLE 178 ##STR125##

The general synthesis of nickel allyl initiators was followed using 462 mg of ligand, 153 mg of [(C₃ H₅)Ni(Cl)]₂, and 1.00 g of NaBAF A beige powder (1.68 g) was isolated. The stability of the complex is poo in CD₂ Cl₂ and THFd₈ at RT. Only broad NMR spectra were obtained. The above structure is therefore tentatively assigned.

EXAMPLE 179

The allyl initiator of Example 178 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 82 mg of catalyst. Polyethylene was not isolated.

EXAMPLE 180

The allyl initiator of Example 178 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 82 mg of catalyst. Polyethylene (2.01 g) was isolated.

EXAMPLE 181 ##STR126##

The general synthesis of nickel allyl initiators was followed using 462 mg of ligand, 211 mg of [(C₃ H₅)Ni(Cl)]₂, and 1.36 mg of NaBAF. A pale orange powder (2.16 g) was isolated. The stability of the complex is poor in CD₂ Cl₂ and THFd₈ at RT. Only broad NMR spectra were obtained. The above structure is therefore tentatively assigned.

EXAMPLE 182

The allyl initiator of Example 181 was used to polymerize ethylene in C₆ D₆ at RT according to the general polymerization procedure using 76 mg of catalyst. Polyethylene (147 mg) was isolated.

EXAMPLE 183

The allyl initiator of Example 181 was used to polymerize ethylene in CDCl₃ at 80° C. according to the general polymerization procedure using 76 mg of catalyst. Polyethylene (434 mg) was isolated.

EXAMPLES 184-177

Following the procedure of Examples 23-66, ethylene was polymerized. The results are reported in Table 6. The structures of the ligands are listed after Table 6.

                  TABLE 6                                                          ______________________________________                                         Ex. No.  Ligand  Ligand/Ni   g. PE                                                                               Tm, ° C.                              ______________________________________                                           184 115 1 9.0 125                                                              185 116 1 2.4 --                                                               186 117 2 2.7 --                                                               187 118 1 5.0 --                                                             ______________________________________                                          ##STR127##                                                                     ##STR128##                                                                     ##STR129##                                                                     ##STR130##                                                               

EXAMPLE 188 Synthesis of 50

9-Anthraldehyde (3.70 g) was dissolved in 100 ml THF in a 200 ml round bottom flask. To the hot solution was added dropwise 2.77 g 2-anthranilamide (in 20 ml THF). Then 4 drops of formic acid were added t the mixture. Soon after adding the formic acid, yellow precipitate began to form. Heating and stirring were continued for another 2 h. After cooling, the solid was isolated by filtering, followed by washing with methanol and THF to remove excess 2-anthranilamide. TLC (5:1 hexane:ethyl acetate) showed a single new band. The dried product weighed 3.5 g. .sup. H NMR (DMSO, δ in ppm):9.82(s, 1H);8.90(m, 3H);8.25(m, 3H);7.90(d, 1);7.67.7(m, 7H);7.45(t, 1).

EXAMPLE 189 Synthesis of 66

1,1-Diphenylacetaldehyde (0.4906 g) was dissolved in 30 ml methanol. To this hot solution was added 0.4881 g 1-amino9-fluorenone (in methanol). Then 6 drops of formic acid was added to catalyze the reaction. Soon afte adding the formic acid, the color of the solution changed from yellow to orange red, then to deep red. At this point, TLC (3:1 hexane:ethyl acetate) showed the appearance of new bands. When cooled, a red precipitate formed. The precipitate was isolated by filtering followed by washing with methanol and hexane. The dried product weighed 0.4 g. The ¹ H, ¹³ C and APT spectra are consistent with the existence of the product as the enamine structure shown above. In addition the structure was confirmed by Xray crystallography. ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) d 9.25 (d, 1, J=12.1, NH), 7.6-6.85 (m, 18, H_(aryl) and CH═CPh₂); ¹³ C NMR (CD₂ Cl₂, 75 MHz, rt, assignments were aided by an APT spectrum) d 194.0 (C═O), 144.6, 143.1, 142.7, 141.2, 137.7, 134.7 121.3 and 115.15 (C_(aryl) not attached to hydrogen and ═CPh₂), 136.6, 133.6, 130.1, 129.2, 128.9, 128.3, 127.6, 126.5, 126.1, 123.1, 121.9, 120.4, 112.7 and 110.8 (C_(aryl) attached to hydrogen and ═CHNHAr).

EXAMPLE 190 Synthesis of 63

1-Aminoanthraquinone (2.2323 g) was dissolved in a 1:1 mixture of methanol and THF. To the hot solution was added 1.9625 g 1,1-diphenylacetaldehyde. Then 8 drops of formic acid was added as catalyst. After refluxing for 4 h, heating was removed. TLC (5:1 hexane:ethyl acetate) showed the appearance of a new band which was purple. The solvent was removed by rotary evaporator. The solid was resuspended in ether and stirred. Filtered to collect the solid, followed by washing with a large amount of ether until a single band was obtained. Pure product was also obtained by silica gel chromatography to give a purple solid. Yield 1.2 g. ¹ H NMR (CD₂ Cl₂, δ in ppm):11.75(d, 1H) ;8.20(m, 2H);7.25-7.85(m, 16H).

EXAMPLE 191 Synthesis of 54

1,1-Diphenylacetaldehyde (3.9250 g) was dissolved in 30 ml anhydrous methanol. To this refluxing solution was added 2.7230 g 2-anthranilamide (in methanol). Soon a yellow precipitate formed. After all the 2-anthranilamide was added, heating and stirring were continued for another hour. When cooled, the solid was isolated by filtering. The solid was then resuspended in methanol, stirred and then filtered. Yield 5.1 g. The ¹ H, ¹³ C, and APT spectra are consistent with the existenc of the product as the enamine structure shown above: ¹ H NMR (THFd₈, 300 MHz, rt, assignments were aided by an APT spectrum) δ 10.86 (br d, 1, J=12.10, NH--CH═CPh₂), 7.60-6.85 (m, 16, H_(aryl), CH═CPh₂, C(O)NHH'), 6.60 (br s, 1, C(O)NHH'); ¹ C NMR (THFd₈, 75 MHz, rt, assignments were aided by an APT spectrum) δ 171.9 (C═O), 145.9, 143.4, 139.7, 120.0 and 116.6 (C_(aryl) not attached to hydrogen and ═CPh₂), 113.4, 131.1, 129.4, 128.8, 127.4, 125.9, 124.9, 117.8 and 113.4 (C_(aryl) attached to hydrogen and ═CHNAr).

EXAMPLE 192 Synthesis of 56

1,1-Diphenylacetaldehyde (4.0138 g) was dissolved in 20 ml anhydrous methanol. To this hot solution was added 3.0918 g methyl anthranilate (in methanol). The color of the solution changed from colorless to yellow as soon as two components were mixed. After adding all the methyl anthranilate, the heat was turned off. During cooling, a yellow precipitate began to form. The precipitate was collected by filtering followed by washing with methanol. After recrystallization in methanol, 2.6 g product was obtained.

The ¹ H, ¹³ C, and APT spectra are consistent with the existence of the product as the enamine structure shown above. In addition, this structure was confirmed by Xray crystallography. ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) δ 9.94 (br d, 1, J=11.73, NH), 8.05-6.75 (m, 15, H_(aryl) and ═CHNHAr), 3.78 (s, 3, OMe); ¹³ C NMR (CD.sub. Cl₂, 75 MHz, rt, assignments were aided by an APT spectrum) δ 168.0 (C═O), 145.4, 141.9, 138.4, 120.9 and 112.1 (C_(aryl) not attached to hydrogen and CH═CPh₂), 134.6, 132.0, 130.3, 129.0, 128.4, 127.3, 126.7, 125.9, 123.4, 117.7 and 112.4 (C_(aryl) attached t hydrogen and CH═CPh₂), 51.8 (OMe).

EXAMPLE 193 Synthesis of 58

9-Anthraldehyde (2.0624 g) was dissolved in 60 ml of a 1:1 mixture of methanol and THF (the 9-anthralaldehyde did not dissolve completely in methanol). To this refluxing solution was added dropwise 1.7729 g 2,6-diisopropylaniline. When the addition was complete, 4 drops of formic acid were added as catalyst. The solution was refluxed for another 2 h before it was cooled. After standing overnight, a yellow solid precipitated. The solid was isolated by filtering followed by washing wit methanol. Yield 2.5 g of dried product. ¹ H NMR (CD₂ Cl₂, δ in ppm): 9.51(s, 1H);9.05(d, 2H);9.20(s, 1H);8.20(d, 2H);7.65(m, 4H);7.30(d, 2H);7.25(t, 1H);3.30(hep, 2H);1.30(d, 12H).

EXAMPLE 194 ##STR131##

The general synthesis of nickel allyl initiators was followed using 136 mg of ligand, 53 mg of [(C₃ H₅)Ni(Cl)]₂, and 342 mg of NaBAF. A yellow powder (430 mg) was isolated.

EXAMPLE 195

The allyl initiator of Example 194 was used to polymerize ethylene in C₆ D₆ at 80° C. according to the general polymerization procedure using 64 mg of catalyst. Polyethylene (104 mg) was isolated. Th ¹ H NMR spectrum of the reaction mixture showed that significant amounts of butenes and higher olefins were produced.

EXAMPLE 196 ##STR132##

The general synthesis of nickel allyl initiators was followed using 129 mg of ligand, 51 mg of [(C₃ H₅)Ni(Cl)]₂, and 317 mg of NaBAF. A sticky orange solid (217 mg) was isolated.

EXAMPLE 197

The allyl initiator of Example 196 was used to polymerize ethylene in CDCl₃ at 60° C. according to the general polymerization procedure using 24 mg of catalyst. The ethylene pressure was initially 1. MPa and was increased to 6.9 MPa after 1 h. A few mg's of polyethylene wa produced. The ¹ H NMR spectrum of the reaction mixture showed that significant amounts of butenes and higher olefins were produced.

EXAMPLE 198 ##STR133##

The general synthesis of nickel allyl initiators was followed using 136 mg of ligand, 49 mg of [(C₃ H₅)Ni(Cl)]₂, and 309 mg of NaBAF. An orange powder (380 mg) was isolated.

EXAMPLE 199

The allyl initiator of Example 198 was used to polymerize ethylene in C₆ D₆ at RT at 5.2 MPa according to the general polymerization procedure using 63 mg of catalyst. Polyethylene (29 mg) was isolated. The ¹ H NMR spectrum of the reaction mixture showed that significant amounts of butenes and higher olefins were produced.

EXAMPLE 200 ##STR134##

The general synthesis of nickel allyl initiators was followed using 111 mg of ligand, 50 mg of [(C₃ H₅)Ni(Cl)]₂, and 328 mg of NaBAF. An orange powder (347 mg) was isolated.

EXAMPLE 202

The allyl initiator of Example 201 was used to polymerize ethylene in CDCl₃ at 60° C. according to the general polymerization procedure using 23 mg of catalyst. The ethylene pressure was initially 1. MPa and was increased to 6.9 MPa after 1 h. A few mg's of polyethylene wa produced. The ¹ H NMR spectrum of the reaction mixture showed that significant amounts of butenes and higher olefins were produced.

EXAMPLE 203 ##STR135##

Using 5.47 g of 1,1diphenylacetaldehyde and 3.60 g of 2,6dimethylaniline, 5.79 g of an orange powder was obtained following a synthesis analogous t that of the 2,6diisopropylaniline derivative given above. The ¹ H, ¹³ C, and APT spectra are consistent with the existence of the product as the enamine structure shown above: ¹ H NMR (CDCl₃, 300 MHz, rt) δ 7.6-7.0 (m, 13, H_(aryl)), 6.88 (d, 1, J=12.1, ArNHCH═CPh₂), 5.47 (d, 1, J=12.1, ArNHCH═CPh₂), 2.37 (s 6, C₆ H_(3Me) ₂); ¹³ C NMR (CDCl₃, 75 MHz, rt, assignments aided by an APT spectrum) δ 142.0, 140.7, 138.9 and 131.1 (Ph: C_(ipso) ; Ph': C_(ipso) ; Ar: C_(ipso) and C_(o)), 131.6, 130.6, 129.3, 128.9, 128.3, 126.9, 125.4, 124.8 and 123.8 (Ph: C_(o), C_(m), C_(p) ; Ph': C_(o), C_(m), C_(p) ; Ar: C_(m), C_(p) ; CH═CPh₂), 114.0 (CH═CPh₂), 13.8 (C₆ H_(3Me) ₂).

EXAMPLE 204 ##STR136##

Using 5.43 g of 1,1diphenylacetaldehyde and 2.71 g of aniline, 5.68 g of yellow powder was obtained following a synthesis analogous to that of the 2,6diisopropylaniline derivative given above. The ¹ H, ¹³ C, an APT spectra are consistent with the existence of the product as the enamine structure shown above: ¹ H NMR (CDCl₃, 300 MHz, rt) δ 7.6-6.8 (m, 15, H_(aryl)), 7.18 (d, 1, J=12.1, PhNHCH═CPh₂), 6.12 (d, 1, J=11.8, PhNHCH═CPh₂); ¹³ C NMR (CDCl₃, 75 MHz, rt, assignments were aided by an APT spectrum) δ 142.7, 141.8 and 138.5 (Ph: C_(ipso) ; Ph': C_(ipso) ; Ph": C_(ipso)), 130.5, 129.6, 129.3, 128.4, 127.2, 126.2, 125.5, 124.8, 120. and 113.9 (Ph: C_(o), C_(m), C_(p) ; Ph': C_(o), C_(m), C_(p) ; Ph": C_(o), C_(m), C_(p) ; CH═CPh₂), 117.7 (CH═CPh₂).

EXAMPLE 205 ##STR137##

Solution of 1.02 g of 2,3butanedione in 10 mL of MeOH and 2.92 g of 2amino-m-cresol were mixed together in a round bottom flask. Formic acid (10 drops) was added via pipette. After ˜1.5 h, a precipitate had formed. The solution was stirred overnight and the next day the precipitate was collected on a frit and washed with methanol. The product was then dissolved in Et₂ O and stirred overnight over Na₂ SO₄. The solution was filtered through a frit with Celite and the solvent was removed in vacuo. A light pink powder was obtained (1.72 g). The ¹ H and ¹³ C are consistent with the product existing as th cyclized diamine rather than as the diimine. [Note: Literature precedent for this cyclization reaction exists, such as in the reaction of oaminophenol with glyoxal or the reaction of oaminobenzoic acid with glyoxal. See: Kliegman, J. M.; Barnes, R. K. J. Org. Chem. 1970, 35, 3140-3143.]: ¹ H NMR (CDCl₃, 300 MHz, rt) δ 6.9-6.5 (m, 6 H_(aryl)) 4.58 (s, 2, NH), 2.20 and 1.62 (s, 6 each, Me, Me'); ¹³ NMR (CDCl₃, 75 MHz, rt) δ 141.7, 127.1 and 122.3 (Ar: C_(ipso), C_(o), C_(o) '), 122.6, 119.8, 114.9 (Ar: C_(m), C.sub. ', C_(p)), 82.0 (--OC(Me)NH--), 22.1 and 16.7 (Me, Me').

EXAMPLE 206 ##STR138##

n a nitrogenfilled drybox, 20.01 g of lithium 2,6diisopropylanilide was placed in a 2neck round bottom flask and dissolved in 300 mL of Et₂ O. A 60 mL solution of 6.93 g of oxalyl chloride was placed in an additio funnel. The oxalyl chloride was added to the reaction mixture over a period of several hours and the mixture was then stirred overnight. Some of the product precipitate out of the Et₂ O solution along with the LiCl. Some of the Et₂ O was removed in vacuo and enough THF was adde to dissolve the product. The solution was filtered through a frit with Celite, the Celite was washed with THF, and the solvent was removed in vacuo. The product was washed with pentane and pumped dry to give 20.72 g of an offwhite powder: ¹ H NMR (CDCl₃, 300 MHz, rt) δ 9.2 (br s, 2, NH), 7.23-7.04 (m, 6, H_(aryl)), 2.94 (septet, 4, CHMe₂) 1.09 (d, 24, CHMe₂).

EXAMPLE 207 ##STR139##

Following the synthetic procedure of the above example, 7.49 g of oxalyl chloride and 15.00 g of lithium 2,6dimethylanilide was used to synthesize 23.98 g of product, which was isolated as an offwhite powder: ¹ H NM (CDCl₃, 300 MHz, rt) δ 9.53 (br 2, 2, NH), 7.00-6.86 (m, 6, H_(aryl)), 2.10 (s, 12, Me).

EXAMPLE 208 ##STR140##

Formic acid catalyst (˜1 mL) was added to a methanol solution of diphenylacetaldehyde (4.44 mL) and 2,6diisopropylaniline (3.18 mL). After ˜15 minutes of stirring, a white precipitate formed. The reaction mixture was stirred for several days before the precipitate was collected on a frit and washed with methanol. The product was then dissolved in Et₂ O and stirred over Na₂ SO₄ overnight. The solution was filtered through a frit with Celite and the solvent was removed in vacuo to yield the product. The ¹ H, ¹³ C, and APT spectra are consistent with the existence of the product as the enamine structure shown above: ¹ H NMR (CD₂ Cl₂, 300 MHz, rt) δ 7.6-7. (m, 13, H_(aryl)), 6.71 (d, 1, J=12.1, ═CHNHAr), 5.37 (d, 1, J=12.5 NHAr), 3.34 (septet, 2, J=6.9, CHMe₂), 1.25 (d, 12, J=7.0, CHMe₂); ¹³ C NMR (CD₂ Cl₂, 300 MHz, rt, assignments were aided by an APT spectrum) δ 144.9 (Ar: C_(o)), 142.5, 139.3 and 138.5 (Ar: C_(ipso), Ph: C_(ipso), Ph': C_(ipso)), 133.9, 130.9 129.7, 128.6, 127.2, 126.2, 125.4, 124.7 and 124.0 (Ph: C_(o), C_(m), C_(p) ; Ph': C_(o), C_(m), C_(p) ; Ar: C_(m), C_(p), Ph₂ C═CH), 113.4 (Ph₂ C═CH), 28.6 (CHMe₂), 23.9 (CHMe₂).

EXAMPLES 209-217

The imines in the following table were synthesized using Procedures A and below. Details are shown in the Table.

A. Formic acid catalyst was added to a methanol solution of the aldehyde and the aniline. The reaction mixture was stirred and the resulting precipitate was collected on a frit and washed with methanol. The product was then dissolved in Et₂ O or CH₂ Cl₂ and stirred over Na₂ SO₄ overnight. The solution was filtered through a frit wit Celite and the solvent was removed in vacuo to yield the product.

B. A CH₂ Cl₂ solution of the aldehyde and the aniline was stirre over sodium sulfate. The solution was filtered through a frit with Celite and the solvent was removed in vacuo. If necessary, the product was purified by heating in vacuo to remove excess aniline and/or by recrystallization.

    __________________________________________________________________________     Example                                                                             Ligand            Synthesis and NMR Data                                  __________________________________________________________________________       209                                                                                                   Procedure A, .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 8.97 (s, 1, CH═N), 8.43  (dd, 1, J                             = 7.8, 1.6, H.sub.aryl), 7.64  (dd, 1, J = 7.6,                                1.3, H.sub.aryl), 7.55  (t, 1, J = 7.2, H.sub.aryl)                            , 7.46 (td,  1, J = 74, 1.7, H.sub.aryl), 7.37 (s,                              2, H.sub.aryl), 1.37 (s, 9, CMe.sub.3), 1.28  (s,                             18, CMe.sub.3), 1.21 (s, 9, CMe.sub.3).                    - 210                                                                                                Procedure A, .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 15.30 (s, 1, OH), 9.09  (s, 1,                                     N═CH), 8.1-7.2 (m, 9,  H.sub.aryl), 3.12                                   (septet, 2, CHMe.sub.2),  1.25 (d, 12, CHMe.sub.2);                             .sup.13 C NMR  (CDCl.sub.3, 75 MHz, rt) δ                               161.7 (C'N).                                               - 211                                                                                                Procedure A. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 15.3 (s, 1, OH), 9.23  (s, 1, N═CH)                            , 8.4-7.1 (m, 9,  H.sub.aryl), 2.41 (s, 6, Me).                                  - 212                                                                          Procedure A. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 14.15 (s, 1, OH), 8.43  (s, 1,                                     N═CH), 7.7-71 (m, 5,  H.sub.aryl), 2.35 (s, 6,                             Me).                                                       - 213                                                                                                Procedure A. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 12.27 (s, 1, OH), 8.85  (N═CH),                                7.6-6.9 (m, 4, H.sub.aryl);  .sup.13 C NMR                                     (CDCl.sub.3, 75 MHz, rt) δ  170.6, 161.5,                                134.9, 133.3, 119.5,  118.7 and 117.8 (N═CH,                               C.sub.aryl  excluding C.sub.6 F.sub.5 resonances).         - 214                                                                                                Procedure A. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 8.20 (s, 1, N═CH), 8.0-  7.0 (m,                               8, H.sub.aryl), 3.00 (septet, 2,  CHMe.sub.2),                                 1.21 (d, 12, CHMe.sub.2); .sup.13 C  NMR (CDCl.sub.                            3, 75 MHz, rt) δ 161.9  (N═CH), 149.3,                               137.6, 136.1, 131.3,  128.8, 128.5, 124.1 and                                  123.0  (C.sub.aryl), 28.0 (CHMe.sub.2), 23.5                                   (CHMe.sub.2).                                              - 215                                                                                                Procedure A. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 8.48 (s, 1, N═CH), 7.35-  6.95 (m,                             3, H.sub.aryl), 2.22 (s, 3,  Me); .sup.13 C NMR                                (CDCl.sub.3, 300 MHz, rt) δ  153.9 (N═CH)                            , 148.2, 130.4, 128.8,  127.6, 125.5 and 122.6                                 (C.sub.aryl  excluding C.sub.6 F.sub.5 resonances),                             18.4  (Me).                                               - 216                                                                                                Procedure B. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 7.99 (s, 1, CH═N), 7.7-  6.5 (m,                               6, H.sub.aryl), 3.00 (septet, 2,  CHMe.sub.2),                                 1.19 (d, 12, CHMe.sub.2); .sup.13 C  NMR (CDCl.sub.                            3, 75 MHz, rt) δ 152,  150.4, 149, 145.5,                                137.8, 124.3,  123.0, 115.0 and 112.0 (N═CH                                and  C.sub.aryl), 27.9 (CHMe.sub.2), 23.6 (CHMe.sub                            .2).                                                       - 217                                                                                                Procedure B. .sup.1 H NMR (CDCl.sub.3, 300  MHz,                             rt) δ 8.35 (s, 1, CH═N), 76-  7.1 (m, 6,                             H.sub.aryl), 3.08 (septet, 2,  CHMe.sub.2), 1.25                               (d, 12, CHMe.sub.2); .sup.13 C  NMR (CDCl.sub.3,                               75 MHz, rt) δ 154.9,  148.5, 142.5, 137.8,                               131.6, 130.1,  127.6; 124.2 and 122.9 (N═CH                                and  C.sub.aryl), 27.9 (CHMe.sub.2), 23.4 (CHMe.sub                            .2).                                                    __________________________________________________________________________

EXAMPLE 218

In a dry and oxygen free atmosphere, the allyl initiator of Example 168 (16 mg) was dissolved in dry CH₂ Cl₂ (2 ml). 5-Ethylidene-2-norbornene (1.8 g) was added. The orange solution warmed and darkened. After stirring for 17 hours the reaction was quenched by addition of methanol and the solid polymer filtered, washed well with methanol and dried. Yield=1.6 g (89%). ¹ H-NMR data confirmed that this was an addition polymer.

EXAMPLE 219 Synthesis of 107

2,6-Dimethylthiophenol (3.0 g) was mixed with 30 ml THF. Then 0.87 g NaOH was added. The mixture was stirred until all the NaOH has dissolved. THF was removed under vacuum. To the solid was added 40 ml DMF and 4.02 g of the bis toluenesulfonate ester of ethylene glycol. The mixture was refluxed for 5-6 h. DMF was removed by rotary evaporator to give a white residue. Water was added to the residue and the mixture extracted with CH₂ Cl₂. After removing CH₂ Cl₂, a white solid remained. TLC (hexane) showed two bands. The second band from a silica-gel column was the desired product.

¹ H NMR (CDCl₃, δ in ppm): 2.43 (s, 12H); 2.72(s, 4H); 7.10(m, 6H).

EXAMPLE 220 Synthesis of 116

9-Anthraldehyde (2.06 g) was dissolved in a minimum amount of THF, then 1.37 g anthranilic acid was added. Four drops of formic acid were added as catalyst. The mixture was refluxed for 7 h. TLC (5:1 hexane:ethyl acetate) gave 3 bands. The second band is the desired product as determined by ¹ H NMR.

EXAMPLE 221 Synthesis of 117

10-chloro-9-anthraldehyde (2.41 g) was dissolved in a mixture of 30 ml THF/20 ml CDCl₃ /50 ml toluene. To this boiling solution was added dropwise 3.5 g 2,6-diisopropylaniline 3-4 drops of formic acid as a catalyst. The solution was refluxed for 13 h. After removing all the solvent, a dark brown thick oil was left. On standing, the oil crystallized. The crystals were washed with methanol.

¹ H NMR (CDCl₃, δ in ppm): 1.40 (d, 12H); 3.35 (p, 2H); 7.40(m, 3H); 7.75(m, 4H); 8.75(d, 2H); 9.05(d, 2H); 9.55(s, 1H).

EXAMPLE 222 Synthesis of 118

10-Chloro-9-anthraldehyde was (2.41 g) was dissolved in 50 ml toluene, and to the hot solution was added 2.0 g of methyl anthranilate (in THF) dropwise. After refluxing for 6 h, a yellow solid precipitated. The solid was isolated by filtration, followed by washing with methanol. The solid was dissolved in 2-3 ml CDCl₃ and after column separation, golden yellow crystals were obtained. ¹ H NMR showed it is a pure product.

¹ H NMR (DMF-d7, δ in ppm): 4.20(s, 3H); 6.50(d, 1H); 6.82(t, 1H); 7.20(t, 1H); 7.63(t, 2H); 7.80(t, 2H); 8.10(s, 1H); 8.30(d, 1H); 8.30(d, 2H); 9.20(d, 2H).

EXAMPLE 223

In a dry and oxygen free atmosphere, the allyl initiator of Example 168 (16 mg) was dissolved in dry CH₂ Cl₂ (2 ml). Dicyclopentadiene (2 ml) was added. The orange solution darkened. After stirring for 72 h the volatiles were removed from the reaction under vacuum. After addition of methanol the solid polymer precipitated and was filtered, washed well with methanol and dried. Yield=0.29 g (15%). The product was insoluble at room temperature in common organic solvents. 

What is claimed is:
 1. A compound of the formula [L¹ _(q) L² _(r) L³ _(s) L⁴ _(t) Ni]⁺ X⁻ (XXXIII), wherein:L¹ is a first monodentate neutral ligand coordinated to said nickel, L² is a second monodentate neutral ligand coordinated to said nickel which may be said first monodentate neutral ligand and r is 0 or 1, or L¹ and L² taken together are a first bidentate neutral ligand coordinated to said nickel and r is 1; L³ and L⁴ taken together are a π-allyl ligand coordinated to said nickel, L³ and L⁴ taken together are ##STR150## coordinated to said nickel, or L³ is a third neutral monodentate ligand selected from the group consisting of ethylene, a norbornene and a styrene or a neutral monodentate ligand which can be displaced by an olefin, and L⁴ is R³⁸ ; X is a relatively non-coordinating anion; q, s and t are each 1; said first monodentate neutral ligand and said first bidentate neutral ligand are selected from the group consisting of ##STR151## Ar¹ is an aromatic moiety with n free valencies, or diphenylmethyl; each Q is --NR² R⁴³ or --CR⁹ ═NR³ ; R⁴³ is hydrogen or alkyl n is 1 or 2; E is 2-thienyl or 2-furyl; each R² is independently hydrogen, benzyl, substituted benzyl, phenyl or substituted phenyl; each R⁹ is independently hydrogen or hydrocarbyl; and each R³ is independently a monovalent aromatic moiety; m is 1, 2 or 3; each R⁴, R⁵, R⁶, and R⁷ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl; each R⁸ is independently hydrocarbyl or substituted hydrocarbyl containing 2 or more carbon atoms; each R¹⁰ is independently hydrogen, hydrocarbyl or substituted hydrocarbyl; Ar² is an aryl moiety; R¹², R¹³, and R¹⁴ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or an inert functional group; R¹¹ and R¹⁵ are each independently hydrocarbyl, substituted hydrocarbyl or an inert functional group whose E_(s) is about -0.4 or less; each R¹⁶ and R¹⁷ is independently hydrogen or acyl containing 1 to 20 carbon atoms; Ar³ is an aryl moiety; R¹⁸ and R¹⁹ are each independently hydrogen or hydrocarbyl; Ar⁴ is an aryl moiety; Ar⁵ and Ar⁶ are each independently hydrocarby; Ar⁷ and Ar⁸ are each independently an aryl moiety; Ar⁹ and Ar¹⁰ are each independently an aryl moiety or --CO₂ R²⁵, wherein R²⁵ is alkyl containing 1 to 20 carbon atoms; Ar¹¹ is an aryl moiety; R⁴¹ is hydrogen or hydrocarbyl; R⁴² is hydrocarbyl or --C(O)--NR⁴¹ --Ar¹¹ ; R⁴⁴ is aryl; R²² and R²³ are each independently phenyl groups substituted by one or more alkoxy groups, each alkoxy group containing 1 to 20 carbon atoms; and R²⁴ is alkyl containing 1 to 20 carbon atoms, or an aryl moiety; R³⁵ is hydrocarbylene; R³⁶ is hydrogen, alkyl, or --C(O)R³⁹ ; each R³⁷ is hydrocarbyl or both of R³⁷ taken together are hydrocarbylene to form a carbocyclic ring; R³⁸ is hydride, alkyl or --C(O)R³⁹ ; and R³⁹ is hydrocarbyl.
 2. The compound as recited in claim 1 wherein X is BF₄ ⁻, PF₆ ⁻, BAF⁻, or SbF₆ ⁻.
 3. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (III).
 4. The compound as recited in claim 3 wherein:n is 1, Q is --CR⁹ ═NR³, R⁹ is hydrogen, Ar¹ is 9-anthracenyl, and R³ is 2-carbamoylphenyl or 2,6-diisopropylphenyl; n is 2 and Q is --CR⁹ ═NR³, R³ is 2,6-disubstituted phenyl in which substitutents are halo, alkyl, or halo and alkyl, Ar¹ is p-phenylene, and R⁹ is hydrogen; n is 1, Q is --CR⁹ ═NR³, R⁹ is hydrogen, R³ is 2,6-dimethylphenyl, and Ar¹ is pentafluorophenyl; or n is 1, Q is --CR⁹ ═NR³, R⁹ is hydrogen, R³ is 2,6-diisopropylphenyl, and Ar¹ is 2-hydroxy-1-naphthyl.
 5. The compound as recited in claim 3 wherein:n is 1, Q is --NR² R⁴³, R² is --CH═CPh₂, R⁴³ is hydrogen, and Ar¹ is 2,6-diisopropylphenyl; n is 1, Q is --NR² R⁴³, R² is --CH═CPh₂, R⁴³ is hydrogen and Ar¹ is 2-carbamoylphenyl; n is 2, Q is --NR² R⁴³, R² is hydrogen, R⁴³ is hydrogen, and Ar¹ is 1,8-napthylylene; n is 1, Q is --NR² R⁴³, R² is --CH═CPh₂, R⁴³ is hydrogen, and Ar¹ is 2-methoxycarbonylphenyl; n is 1, Q is --NR² R⁴³, R² is hydrogen, R⁴³ is hydrogen, and Ar¹ is 2-carboxyphenyl; n is 1, Q is --NR² R⁴³, R² is --CH═CPh₂, R⁴³ is hydrogen, and Ar¹ is 1-anthraquinonyl; n is 1, Q is NR² R⁴³, R² is --CH═CPh₂, R⁴³ is hydrogen, and Ar¹ is ##STR152## or wherein (III) is ##STR153##
 6. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (V).
 7. The compound as recited in claim 6 wherein: m is 1, all of R⁸, R⁴, R⁵, R⁶ an R⁷ are hydrogen, and both of R¹⁰ are 2,6-diisopropylphenyl; orm is 1, all of R⁸, R⁴, R⁵, R⁶ an R⁷ are hydrogen, and both of R¹⁰ are cyclohexyl.
 8. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XVI).
 9. The compound as recited in claim 8 wherein:Ar² is 2-(N-2,2-diphenylethenylamino)phenyl and R¹⁰ is hydrogen; Ar² is phenyl and R¹⁰ is 2,6-diisopropylphenyl; Ar² is 2-pyridyl and R¹⁰ is hydrogen; or Ar² is 3-hydroxy-2-pyridyl and R¹⁰ is hydrogen.
 10. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XVII).
 11. The compound as recited in claim 10 wherein:R¹¹ and R¹⁵ are t-butyl and R¹², R¹³ and R¹⁴ are hydrogen; R¹¹, R¹³ and R¹⁵ are t-butyl and R¹² and R¹⁴ are hydrogen; R¹¹ and R¹⁵ are phenyl and R¹², R¹³ and R¹⁴ are hydrogen; or R¹¹ is t-butyl and R¹² and R¹⁴ are hydrogen, R¹³ is methoxy, and R¹⁵ is 2-hydroxy-3-t-butyl-5-methoxyphenyl.
 12. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XVIII).
 13. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XIX).
 14. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XX) both of R⁴⁴ are phenyl.
 15. The compound as recited in claim 14 wherein:both of R¹⁶ and R¹⁷ are hydrogen; or both of R¹⁶ and R¹⁷ are acetyl.
 16. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXI).
 17. The compound as recited in claim 16 wherein Ar³ is 2-aminophenyl.
 18. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXII).
 19. The compound as recited in claim 18 wherein R¹⁸ and R¹⁹ are both methyl or both hydrogen.
 20. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXIII).
 21. The compound as recited in claim 20 wherein Ar⁴ is phenyl.
 22. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXIV).
 23. The compound as recited in claim 22 wherein both of Ar⁵ and Ar⁶ are phenyl or wherein both of Ar⁵ and Ar⁶ are cyclohexyl.
 24. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXV).
 25. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXVI).
 26. The compound as recited in claim 25 wherein Ar⁷ is p-tolyl or phenyl and Ar⁸ is 2,6-diisopropylphenyl.
 27. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXVII).
 28. The compound as recited in claim 27 wherein:Ar⁹ and Ar¹⁰ taken together are 1,8-naphthylylene; or Ar⁹ is --CO₂ CH₃ and Ar¹⁰ is ##STR154##
 29. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXVIII).
 30. The compound as recited in claim 29 wherein: all of R²², R²³ and R²⁴ are 2,4,6-trimethoxyphenyl;both of R²² and R²³ are 2,3,6-trimethoxyphenyl and R²⁴ is ethyl; all of R²², R²³ and R²⁴ are 2,6-dimethoxyphenyl; or both of R²² and R²³ are 2,3,6-trimethoxyphenyl and R²⁴ is isopropyl.
 31. The compound as recited in claim 29 wherein at least one of R²², R²³ and R²⁴ is substituted and that a sum of σ and σ* constants for at least one of R²², R²³ and R²⁴ is about -0.50 or less.
 32. The compound as recited in claim 31 wherein R²⁴ is an aryl moiety, all of R²², R²³ and R²⁴ are substituted, and said sum of said σ and σ* constants for each of R²², R²³ and R²⁴ is about -0.50 or less.
 33. A compound of the formula ##STR155## wherein: E is 2-thienyl or 2-furyl;Ar⁵ and Ar⁶ are each independently hydrocarby.
 34. The compound as recited in claim 33 wherein both of Ar⁵ and Ar⁶ are phenyl or wherein both of Ar⁵ and Ar⁶ are cyclohexyl.
 35. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXXVI).
 36. The compound as recited in claim 1 wherein (XXXVI) is ##STR156##
 37. The compound as recited in claim 1 wherein said first compound or said first monodentate neutral ligand is (XXXVII).
 38. The compound as recited in claim 37 wherein both of R⁸ are aryl moieties and all of R⁴, R⁵, R⁶, R⁷ and R⁸ are hydrogen.
 39. The compound as recited in claim 1 wherein X is BAF.
 40. The or compound as recited in claim 1 wherein r is
 1. 41. The compound as recited in claim 1 wherein r is
 0. 42. The compound as recited in claim 41 wherein (XXXIII) is a dimer with bridging L¹ ligands.
 43. The compound as recited in claim 3 wherein: n is 2Q is --CR⁹ ═NR³ ; Ar¹ is diphenylmethyl;R⁹ is hydrogen and R³ is selected from the group consisting of 2,6-diisopropylphenyl, 2-carbamoylphenyl, 2-methoxycarbonylphenyl, 1-anthraquinolyl, 2,6-dimethylphenyl and 1-fluoren-9-onyl.
 44. The compound as recited in claim 1 wherein L³ and L⁴ taken together are a π-allyl group. 